Vigilance
Whenever this creature attacks, you may tap another untapped creature you control. If you do, this creature can't be blocked this turn.

Creatures you control get +1/+0 until end of turn.

When this Equipment enters, attach it to target creature you control.
Equipped creature gets +2/+0.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Exile up to two target creatures you control, then return those cards to the battlefield under their owner's control.
Draw a card.

Flash
Enchant creature
When this Aura enters, enchanted creature gains first strike until end of turn.
Enchanted creature gets +2/+0.

Body Thief — When you cast this spell, you may exile a creature you control and put a takeover counter on it.
You may have The Master enter as a copy of a creature card in exile with a takeover counter on it.

Sketch and Lore — , : Target opponent exiles cards from the top of their library until they exile an instant, sorcery, or creature card. You may cast that card without paying its mana cost. If you cast a creature spell this way, it gains haste and "At the beginning of the end step, sacrifice this creature." Activate only as a sorcery.

At the beginning of combat on your turn, you may have target creature get +2/+0 until end of turn.

When this creature dies, create a 2/1 black Cat creature token.

At the beginning of each player's draw step, that player draws an additional card.
Each player may play an additional land on each of their turns.

Vigilance
When this creature enters, you take the initiative.

Prevent the next 4 damage that would be dealt this turn to any number of targets, divided as you choose.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

The Ring tempts you. Search your library for a card that shares a color with a legendary creature you control, reveal it, put it into your hand, then shuffle.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Search your library for a Doctor card, reveal it, put it into your hand, then shuffle.
II — Create a Food token and a 1/1 white Human creature token with "Doctor spells you cast cost less to cast."
III — Create a token that's a copy of target creature, except it's a legendary Alien named Prisoner Zero.

Menace
Whenever Sauron attacks, exile target creature card from your graveyard. Create a tapped and attacking token that's a copy of that card, except it's a 3/3 black Wraith with menace. At the beginning of the next end step, exile that token unless Sauron is your Ring-bearer.

: Target creature gets -X/-0 until end of turn, where X is the number of Merfolk and/or Faeries you control.

Whenever this creature attacks, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Whenever a face-down creature you control enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Whenever a permanent you control is turned face up, if it's a creature, it gets +2/+2 until end of turn.

Flying
When this creature enters, create a 4/4 red Dragon creature token with flying.

Flying
Apocalypse Demon's power and toughness are each equal to the number of cards in your graveyard.
At the beginning of your upkeep, tap this creature unless you sacrifice another creature.