Flying
This creature can block only creatures with flying.

Flash (You may cast this spell any time you could cast an instant.)
Reach (This creature can block creatures with flying.)

, , Sacrifice this artifact: Return target artifact card from your graveyard to the battlefield.

Domain — Each creature gets -X/-X until end of turn, where X is 1 plus the number of basic land types among lands you control.

: Add three mana of any one color. Spend this mana only to cast creature spells.

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)
, Pay 2 life: Add one mana of any color.

Lifelink
Enchantment spells you cast have affinity for Auras. (They cost less to cast for each Aura you control.)
Whenever you cast an Aura spell that targets a modified permanent you control, draw a card. (Equipment, Auras you control, and counters are modifications.)

, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Whenever you scry, this creature gets +1/+0 until end of turn and can't be blocked this turn. This ability triggers only once each turn.

This land enters tapped unless you control two or fewer other lands.
: Add or .

First strike
Whenever this creature attacks, you may cast target instant or sorcery card from your graveyard by paying in addition to its other costs. If that spell would be put into a graveyard, exile it instead. When you cast that spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value.

(: Add .)

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.

Flying
At the beginning of your upkeep, draw a card unless target opponent sacrifices a creature of their choice or pays 3 life.

When this creature enters, tap target creature an opponent controls.

: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)
Swampcycling (, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

When this creature dies, create two 1/1 white Spirit creature tokens with flying.

Haste
When Devil K. Nevil enters, jump it over any number of creatures. If it clears those creatures, put that many +1/+1 counters on it. (You can see a jumping demonstration at DevilKNevil.com.)

Flying
When this creature enters, reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard.

Enchant artifact or creature
Enchanted permanent doesn't untap during its controller's untap step.