The result is that you get to make an arbitrarily large army of Squirrels
However, the fact that Treetop Sentries can trade a Food for a card is a valuable thing, and Thornvault Forager searches out your important Squirrels, so whether or not you use it for mana creation (and thereby forage) doesn't really matter
For example, if a 5/5 creature that's also a planeswalker with three loyalty counters on it is dealt 4 damage, it's been dealt 1 excess damage and Aegar's ability may trigger
Head of the Class would fit best in an Orzhov (whiteblack) spellsmatter or heroicstyle deck that plays a high density of cheap instants and sorceries that target creaturessuch as protection spells, pump spells, or removal that can target your own creatureso you consistently trigger Repartee while also discounting a key spell each turn
This makes Devour simply seem worse than the various Last Gasp and Smother style cards that actually don't have the capacity to take out fatties
Im thinking commanders like Svella, Ice Shaper, Zacama, Primal Calamity, or Shattergang Brothers
