mtg.wtf

Look at the top two cards of target opponent's library. Exile one of them face down and put the other on the bottom of that library. You may play the exiled card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell.
Flashback {1}{U}{B}

Cast this spell only during an opponent's turn, before attackers are declared.
Creatures the active player controls attack this turn if able.
At the beginning of the next end step, destroy all non-Wall creatures that player controls that didn't attack this turn. Ignore this effect for each creature the player didn't control continuously since the beginning of the turn.

{T}: Add {C}{C}.

Sisay, Weatherlight Captain gets +1/+1 for each color among other legendary permanents you control.
{W}{U}{B}{R}{G}: Search your library for a legendary permanent card with mana value less than Sisay's power, put that card onto the battlefield, then shuffle.

{T}: Add {R}.

Reach
Whenever Six attacks, mill three cards. You may put a land card from among them into your hand.
During your turn, nonland permanent cards in your graveyard have retrace.

As Six-y Beast enters, you secretly put six or fewer +1/+1 counters on it, then an opponent guesses the number of counters. If that player guesses right, sacrifice Six-y Beast after it enters.

Sizzle deals 3 damage to each opponent.

Spectacle {R}
Skewer the Critics deals 3 damage to any target.

Sacrifice a Goblin: Add {R}.

Flying
Infect
{B}: Skithiryx, the Blight Dragon gains haste until end of turn.
{B}{B}: Regenerate Skithiryx.

When you cast a creature spell, sacrifice Skittering Horror.

Flying
When you cast a creature spell, sacrifice Skittering Skirge.

Kicker {R}
Trample, haste
At the beginning of the end step, if Skizzik wasn't kicked, sacrifice it.

Toxic 1
Skrelv, Defector Mite can't block.
{W/P}, {T}: Choose a color. Another target creature you control gains toxic 1 and hexproof from that color until end of turn. It can't be blocked by creatures of that color this turn.

{1}, {T}, Sacrifice a creature: Skull Catapult deals 2 damage to any target.

Flying
When Skull Saucer enters, destroy target creature and put your head on the table. Sacrifice Skull Saucer when your head stops touching the table.

{5}, {T}: Return target enchantment card from your graveyard to your hand.

Equipped creature gets +1/-1.
Whenever equipped creature dies, draw two cards.
Equip {1}

Players can't gain life this turn. Damage can't be prevented this turn. Skullcrack deals 3 damage to target player or planeswalker.

Ninjutsu {B}
Whenever Skullsnatcher deals combat damage to a player, exile up to two target cards from that player's graveyard.

Sky Diamond enters tapped.
{T}: Add {U}.

When Skyclave Apparition enters, exile up to one target nonland, nontoken permanent you don't control with mana value 4 or less.
When Skyclave Apparition leaves the battlefield, the exiled card's owner creates an X/X blue Illusion creature token, where X is the mana value of the exiled card.

{1}, {T}: Add {W}{U}.