Mystery Booster Playtest Cards

Mystery Booster Playtest Cards contains 125 cards.
Released: 2019-11-07
Base set size: 121 cards.
Xyru Specter

Xyru Specter {2}{B}{B}

Summon Specter
Whenever Xyru Specter deals damage to an opponent, that player discards a card unless they challenge you. If challenged, and you show them two black cards in your hand, they must discard two cards.
Yawgmoth's Testament

Yawgmoth's Testament {2}{B}

Until end of turn, you may play face-up cards you own from exile.
If a card would be put into your graveyard or exile from anywhere this turn, put it on the bottom of your library instead.

Bombardment {R}

Until end of turn, cards you own that aren't on the battlefield lose all card types, costs, names, and abilities and become red sorceries named Missile that cost {R} with "Missile deals 2 damage to any target."
High Troller

High Troller {3}{R}

Creature - Troll Shaman
All targeted spells and abilities cost {2} less and have their targets chosen randomly.
Impatient Iguana

Impatient Iguana {1}{R}

Creature - Lizard Wizard
If Impatient Iguana is in your opening hand and you're not the starting player, you may reveal it. If you do, you become the starting player.
Lazier Goblin

Lazier Goblin {R}

Creature - Goblin
Motivate {3}{R} (This creature can't attack or block unless you have paid its motivate cost once. Motivate only as a sorcery.)
When Lazier Goblin enters the battlefield, it deals 2 damage to any target.
Lightning Colt

Lightning Colt {3}{R}{R}

Instant Creature - Horse
When Lightning Colt enters the battlefield, it deals 3 damage to any target.
Mana Abundance

Mana Abundance {2}{R}

World Enchantment
If a player would add mana, instead all players add that mana.

Planequake {X}{R}

Planequake deals X damage to each creature without flying and each planeswalker. If X is 10 or more, open the "Uncovered Cavern" plot booster.
Problematic Volcano

Problematic Volcano {1}{R}{R}

World Enchantment
When Problematic Volcano enters the battlefield, it deals 4 damage to any target. Then, starting with you, each player assigns their creatures to the left or right of the volcano. Creatures enter the battlefield to the left or right of the volcano.
Creatures can't block creatures on the other side of the volcano.
Queue of Beetles

Queue of Beetles {3}{R}

Creature - Insect
The stack is now first in, first out instead of last in, first out. (The first spell or ability on the stack is the first one to resolve.)
Red Herring

Red Herring {1}{R}

Creature - Fish
{1}{U}: Exchange Red Herring from your hand with a permanent you control on the battlefield or a spell you control on the stack. If that permanent or spell was the target of a spell or ability, change that target to Red Herring.
Seasoned Weaponsmith

Seasoned Weaponsmith {2}{R}

Creature - Bird Warrior
Tasty (This creature can be attacked directly. If it is attacked, it can't block creatures that didn't attack it.)
Siege Elemental

Siege Elemental {4}{R}{R}

Creature - Elemental
Untapped creatures can't block.
Tapped creatures can block.
Throat Wolf

Throat Wolf {1}{R}{R}

Summon Wolf
You may cast Throat Wolf during an opponent's combat phase.
Firstest strike (This creature deals combat damage to creatures before creatures with first strike.)
After each opponent's first combat phase of each turn, there is an additional combat phase. Only Throat Wolf can attack during that combat phase.
Tibalt the Chaotic

Tibalt the Chaotic {1}{R}{R}

Legendary Planeswalker - Tibalt
[+1]: Cast a copy of one of the following cards chosen at random—Ignorant Bliss, Crack the Earth, Blazing Volley.
[–3]: Cast a copy of one of the following cards chosen at random—Seething Song, Dance with Devils, Flamebreak.
[–6]: Cast a copy of one of the following cards chosen at random—Hellion Eruption, Insurrection, Warp World.

Transcantation {1}{R}

Target instant or sorcery spell becomes a copy of Lightning Bolt. Its controller may choose new targets for it.
Trial and Error

Trial and Error {R}{R}

Elemental Instant - Fire
Whenever Trial and Error is countered or fizzles, you may copy it and choose new targets for the copy.
Trial and Error deals 3 damage to any target.
Geometric Weird

Geometric Weird {R}

Creature - Weird
At the beginning of each end step, you may have Geometric Weird's base power and toughness each become equal to the greatest number of spells and abilities from different sources that were on the stack simultaneously that turn.
Whammy Burn

Whammy Burn {R}

Shuffle your whammy deck, then reveal cards from the top of your whammy deck until you reveal an Island or choose to stop. Then, if no Islands were revealed this way, Whammy Burn deals X damage to any target, where X is the number of cards revealed. (A whammy deck consists of a Plains, Island, Swamp, Mountain, and Forest.)
Bear with Set's Mechanic

Bear with Set's Mechanic {1}{G}

Creature - Bear
Aggressive (During your turn, there is an additional combat phase after the first, and only creatures with aggressive may attack during it.)
Domesticated Mammoth

Domesticated Mammoth {1}{G}

Snow Creature - Mammoth
Domesticated Mammoth enters the battlefield with a token copy of Pacifism attached to it.
Related card: Pacifism
Experiment Five

Experiment Five {G}

Creature - Bear Snake Mutant
{1}{Z}: Put a +1/+2 counter on Experiment Five. ({Z} is paid with one mana from any source that could produce two or more colors of mana.)
Frenemy of the Guildpact

Frenemy of the Guildpact {1}{G}

Creature - Spirit
Protection from enemy-colored multicolored (This creature can't be blocked, targeted, dealt damage, enchanted, or equipped by anything that's two enemy colors, such as blue and green.)
Generated Horizons

Generated Horizons {2}{G}{G}

At the beginning of your upkeep, create a Forest land token.