The Critrog Monster

Lifelink
At the beginning of your upkeep, sacrifice The
Critrog Monster unless you sacrifice a creature.
You may roll an additional d20 on each of your
rolls and choose the highest result.
Whenever one or more creatures are put
into your graveyard from anywhere, roll a d20.
1-14 | Roll again.
15-19 | Draw a card.
20 | Draw three cards.