Ignar, Form of the Many

Eminence — Whenever you cast a spell, if Ignar
is in the command zone, create a 0/1 red ember
creature token, then flip a coin. On tails, Ignar
deals 10 damage to you unless you pay {1}.
Devour X, where X is the number of creatures
devoured this way (As this enters the battlefield,
you may sacrifice any number of creatures. This
creature enters the battlefield with X +1/+1 counters
on it for each of those creatures.)
Ignar enters the battlefield with one haste and
four -1/-1