Teostra

Flying, Blastblight, Fireblight, Menace
Supreme Ascension - Whenever Teostra
destroys a creature put a Supreme counter on it,
then if it has 5 or more Supreme counters on it
you may transform Teostra
{2}{r}{r}: Deal 4 damage to 2 creatures
{6}{r}{r}: Deal 10 damage divided amongst 3
creatures