This spell costs less to cast if it targets an attacking nontoken creature.
Target creature's owner puts it on their choice of the top or bottom of their library.

Enchant creature
Enchanted creature can't attack or block.
, Sacrifice this Aura: Exile enchanted creature. You create a 1/1 black Ninja creature token. Activate only as a sorcery.

Up to three target creatures can't block this turn.

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Cycling

Enchant creature
Enchanted creature gets +2/+2 and can't block.
When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.

Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control with a +1/+1 counter on it."

Exile cards from the top of your library until you exile a nonland card. Undying Flames deals damage to any target equal to that card's mana value.
Epic

Target creature gains undying until end of turn.

When this creature dies, put it on top of its owner's library.

Flying
: This creature gets +1/-1 until end of turn.
Basic landcycling

Return two target creatures to their owners' hands.

: Add one mana of any color. During your next untap step, as you untap your permanents, return this land to its owner's hand.

Whenever this creature attacks, exile target creature card from your graveyard.
When this creature dies, put all cards exiled with it onto the battlefield.

This creature attacks each combat if able.
Escape — , Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)
This creature escapes with a +1/+1 counter on it.

When this creature enters, create a number of 1/1 green Squirrel creature tokens equal to your devotion to black.

Underworld Fires deals 1 damage to each creature and each planeswalker. If a permanent dealt damage this way would die this turn, exile it instead.

Whenever an opponent draws a card, this enchantment deals 1 damage to that player.

Enchant land
Enchanted land has ", Pay 1 life: Draw a card."

Constellation — Whenever this creature or another enchantment you control enters, you gain 1 life.
, Pay 1 life: Each opponent loses 1 life.

This creature can't block.
Escape — , Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)
This creature escapes with two +1/+1 counters on it.

This creature can't be blocked except by three or more creatures.
Cards in graveyards can't be the targets of spells or abilities.
When this creature dies, exile it and each player returns all creature cards from their graveyard to their hand.

Each nonland card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.)
At the beginning of the end step, sacrifice this enchantment.

(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
When you unlock this door, surveil 2.

(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
When you unlock this door, manifest dread, then put a +1/+1 counter on that creature.

Hit like a crashing wave

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

, , Discard a card: Return target creature card from your graveyard to your hand.

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

Flash
This creature enters tapped.

If you would draw a card, instead look at the top three cards of your library, then put one into your hand and the rest into your graveyard.
Pay 4 life: This creature gains indestructible until end of turn. Tap it.