Lurking Spinecrawler

, Sacrifice this creature: Target player loses 1 life and you gain 1 life.

Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand.

When this creature enters, surveil 2. Then for each card you put on top of your library, you draw a card and you lose 3 life.

Descend 8 — Whenever you draw a card, if there are eight or more permanent cards in your graveyard, target opponent loses 1 life and you gain 1 life.

Flying

Rankle has lifelink and haste as long as an opponent controls no creatures.

When Rankle enters, you may pay 1 life. When you do, each player discards a card and sacrifices a creature.

Whenever a player discards a card, Rankle perpetually gets +1/+0.

When this creature specializes, conjure a duplicate of target creature card exiled with this creature into your hand. The duplicate perpetually gains "You may spend mana as though it were mana of any color to cast this spell" and "When this creature enters, each opponent loses 2 life and you gain 2 life."

: Exile target card from a graveyard.

Whenever you cast an instant or sorcery spell, surveil 1.

At the beginning of your end step, each opponent may sacrifice a nontoken creature of their choice. Each opponent who doesn't loses 2 life for each instant and sorcery card in your graveyard.

Lifelink

Whenever a Boar you control attacks, each nonland card in defending player's hand perpetually gains "When you cast this spell, you lose 1 life."