mtg.wtf

Target opponent discards a card. Then they may discard an additional card. If they don't, conjure a duplicate of a random card from their library into your hand. It perpetually gains "You may spend mana as though it were mana of any color to cast this spell."

Whenever a creature deals combat damage to a player, its controller may draw a card.
Whenever chaos ensues, you have no maximum hand size for the rest of the game.

Underdark Beholder enters the battlefield with ten eyestalk counters on it.
If Underdark Beholder would be dealt damage, remove that many eyestalk counters from it instead. If you can't, sacrifice it.
Whenever Underdark Beholder attacks, reveal cards from the top of your library until you reveal an instant, sorcery, or enchantment card with converted mana cost less than the number of eyestalk counters on Underdark Beholder. You may cast it without paying its mana cost. Shuffle your library.

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to pay Un-costs.

As an additional cost to cast this spell, you may pay {2}{R}.
Prevent all combat damage that would be dealt this turn. If this spell's additional cost was paid, this effect doesn't affect combat damage that would be dealt by red creatures.

Choose target spell. If it's a creature spell, it perpetually gets -2/-0. Counter that spell unless its controller pays {2}.

Creatures with islandwalk can be blocked as though they didn't have islandwalk.

When Undying Beast dies, put it on top of its owner's library.

Target nontoken creature you control gets +2/+0 and gains double team until end of turn. It also gains first strike until end of turn if it has the same name as another creature you control or a creature card in your graveyard.

Draw two cards. Then you may exile an instant or sorcery card from your hand. If you do, search your hand and library for any number of cards with the same name, exile them, then shuffle. Seek an instant or sorcery card for each card exiled from your hand this way.

Hidden agenda
You may spend mana as though it were mana of any color to cast spells with the chosen name.

{TK}{TK} — {T}: Add {2}. Spend this mana only to cast creature spells.
{TK}{TK}{TK}{TK} — At the beginning of combat on your turn, target noncreature artifact you control becomes a 4/4 artifact creature with flying until end of turn.
{TK}{TK} — 2/4
{TK}{TK}{TK}{TK}{TK} — 8/6

{TK}{TK} — {T}: You gain 1 life.
{TK}{TK}{TK}{TK} — Whenever this creature attacks, tap each creature an opponent controls with the same power and/or same toughness as this creature.
{TK}{TK} — 4/1
{TK}{TK}{TK} — 2/6

Black legendary creatures you control have "bands with other legendary creatures."

Unholy Heat deals 2 damage to target creature or planeswalker.
Delirium — Unholy Heat deals 4 damage instead if there are four or more card types among cards in your graveyard.

First strike, haste
Equipped creature has first strike and haste.
Equip {1}
Crew 1

Hand Backup 1 (When this creature enters the battlefield, you may reveal a creature card from your hand. When it eventually comes into play, if you cast it from your hand, it enters with a +1/+1 counter. It also gains the following ability in your hand until end of turn.)
Basic Landcycling {1} ({1}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Unified Lunge deals X damage to each player, where X is the number of Heads on the battlefield.

{TK}{TK} — {T}: Add one mana of any color.
{TK}{TK}{TK} — Whenever this creature attacks, if it's not a Brushwagg, it gets +X/+0 until end of turn, where X is the number of supertypes, card types, and subtypes it has.
{TK}{TK} — 5/1
{TK}{TK}{TK}{TK} — 4/8

When you encounter this, Each player opens a Magic the Gathering booster pack. They may select up to two cards from that pack and exile them face down. For the rest of the game, players may look at and play cards exiled this way without paying their mana costs. (Then Planeswalk away from this phenomenon.)

When building your deck, choose white, blue, black, red, or green (Circle it to indicate your selection.)
{T}: Add one mana of the chosen color.
{1}, {T}: Add 1 mana of any color.

Target creature gets +1/+0 and gains flying until end of turn.
Whenever you put an art sticker on a creature, you may return Unlawful Entry from your graveyard to your hand.

When you encounter Unleash the Flux, each player sacrifices a nonland permanent of their choice, then you flip a coin. If you lose the flip, repeat this process.

{1}{W}: Target nonattacking, nonblocking creature gets +0/+2 until end of turn.

Search your library for a Doctor card, reveal it, put it into your hand, then shuffle.