Whenever a creature enters the battlefield under your control, you gain 1 life.

To solve — You've gained 5 or more life this turn. (If unsolved, solve at the beginning of your end step.)

Solved — Sacrifice this Case: Creature cards in your graveyard gain "You may cast this card from your graveyard" until end of turn.

Delirium — This spell costs less to cast if there are four or more card types among cards in your graveyard.

Flying

Cast this spell only if you control two or more Vampires.

Destroy target creature. You gain 4 life.

Feast of Flesh deals X damage to target creature and you gain X life, where X is 1 plus the number of cards named Feast of Flesh in all graveyards.

All creatures get -4/-4 until end of turn. You become the monarch.

At the beginning of your end step, if one or more creatures died this turn, you gain that much life and distribute that many +1/+1 counters among creatures you control.

At the beginning of each upkeep, if an opponent lost life last turn, put a +1/+1 counter on target creature you control.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Flying

Devour 2 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with twice that many +1/+1 counters on it.)

Vigilance, trample

When Feasting Troll King enters the battlefield, if you cast it from your hand, create three Food tokens. (They're artifacts with ", , Sacrifice this artifact: You gain 3 life.")

Sacrifice three Foods: Return Feasting Troll King from your graveyard to the battlefield. Activate only during your turn.

Target creature gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard.

At the beginning of your upkeep, Grim Feast deals 1 damage to you.

Whenever a creature is put into an opponent's graveyard from the battlefield, you gain life equal to its toughness.

Flying

At the beginning of your upkeep, each opponent draws a card.

Destroy target creature with flying. Bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.)

When Rotfeaster Maggot enters the battlefield, exile target creature card from a graveyard. You gain life equal to that card's toughness.

Target player loses 4 life and you gain 4 life.

Vampiric Feast deals 4 damage to any target and you gain 4 life.