Frenrir, the Monstrous Wolf

Unless your devotion to red and white is 7 or
greater, Frenrir isn't a creature.
Trample, Indestructible
When Fenrir enters the battlefield choose either instant or sorcery card type. Target player cannot
cast spells of the chosen type until Fenrir
leaves the battlefield. Whenever a player gains life,
put a +1/+1 counter of Frenrir.
{7}: Monstrosity 4. Fenrir destroys target artifact
when he becomes monstrous.