Masticore

At the beginning of your upkeep, sacrifice this creature unless you discard a card.

, Exile a creature card from your graveyard: This creature deals 4 damage to any target.

: Regenerate this creature.

First strike (This creature deals combat damage before creatures without first strike.)

At the beginning of your upkeep, sacrifice this creature unless you discard a card.

At the beginning of your draw step, you may have this creature deal 3 damage to target creature.

This creature enters with three +1/+1 counters on it.

At the beginning of your upkeep, sacrifice this creature unless you remove a +1/+1 counter from it.

, Discard a card: Put a +1/+1 counter on this creature.

At the beginning of your upkeep, sacrifice this artifact.

When this artifact is put into a graveyard from the battlefield, it deals 3 damage to any target.

At the beginning of your upkeep, put a time counter on this artifact.

, , Sacrifice this artifact: This artifact deals damage equal to the number of time counters on it to each creature and each player.

Devoid (This card has no color.)

Flying

At the beginning of your upkeep, sacrifice a creature.

Whenever you sacrifice a creature, draw a card.