You may look at the top card of your library any time. You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost. {T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.

Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays {X}, where X is this creature's power.

{B}, Pay 2 life: Draw a card.

At the beginning of your end step, if you gained life this turn, each opponent loses 1 life. At the beginning of your end step, if you gained and lost life this turn, create a 1/1 black Bat creature token with flying. {1}{B}, Pay 2 life: Draw a card.

Lifelink Whenever an opponent attacks with creatures, if two or more of those creatures are attacking you and/or planeswalkers you control, draw a card. Whenever an opponent casts their second spell each turn, draw a card.

At the beginning of your upkeep, you draw a card and you lose 1 life.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.) Artifacts and creatures your opponents control enter tapped.

Flash If a nontoken creature would enter and it wasn't cast, exile it instead.

Shadow (This creature can block or be blocked by only creatures with shadow.) If a card would be put into an opponent's graveyard from anywhere, instead exile it with a void counter on it. {T}, Sacrifice this creature: Choose an exiled card an opponent owns with a void counter on it. You may play it this turn without paying its mana cost.

Creatures your opponents control enter tapped. Whenever a creature an opponent controls enters, you gain 1 life.

Flying, deathtouch Whenever an opponent loses life, you gain that much life. (Damage causes loss of life.)

Whenever an opponent casts a noncreature spell, that player loses 2 life and you gain 2 life.

Whenever a land an opponent controls enters, that player loses 2 life and you gain 2 life.

Lifelink (Damage dealt by this creature also causes you to gain that much life.) If you would gain life, you gain twice that much life instead.

Lifelink (Damage dealt by this creature also causes you to gain that much life.) As long as you have 30 or more life, this creature gets +5/+5 and has flying.

Deathtouch Whenever you draw a card, you gain 2 life. Whenever an opponent draws a card, they lose 2 life.

Whenever another creature enters, you gain 1 life.

Whenever another creature enters, you may gain 1 life.

Whenever another creature you control enters, you may gain 1 life. Whenever a creature an opponent controls enters, you may have that player lose 1 life.

Whenever a player casts their second spell each turn, you lose 1 life and create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Flying Whenever you gain life, each opponent loses 1 life.

Whenever you gain life, target opponent loses that much life. When Enduring Tenacity dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment. (It's not a creature.)

When this creature enters, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

Whenever you gain life, each opponent loses 1 life.

Offspring {2}{B} (You may pay an additional {2}{B} as you cast this spell. If you do, when this creature enters, create a 1/1 token copy of it.) Flying This creature can't block. Whenever you gain life, each opponent loses 1 life.

Whenever you gain life, target opponent loses that much life. {3}{B}{B}: Creatures you control gain lifelink until end of turn.

Flying, lifelink Whenever another nontoken creature you control dies, return that card to its owner's hand at the beginning of the next end step. If a creature an opponent controls would die, exile it instead.

Flying, deathtouch, lifelink Whenever you gain life, Rodolf Duskbringer gains indestructible until end of turn. At the beginning of your end step, you may pay {1}{W/B}. When you do, return target creature card with mana value X or less from your graveyard to the battlefield, where X is the amount of life you gained this turn.