Can I banish units from the trash?

Yes, you can banish units from the trash.

According to Rule 414.1, "Banishing is the action of placing a card from any zone to Banishment." Since the trash is a zone, cards (including units) located there are valid targets for banish effects, provided the specific card or ability you are using explicitly instructs you to banish from the trash.

For example, Rule 414.5 explicitly lists "Banish 2 cards from your trash" as a valid format for a game effect.

Important considerations:

  • Targeting: While units in the trash are treated as cards and cannot be affected by spells that target "units" (which defaults to units on the board per Rule 140.1.b.2), they can be affected by effects that specifically target or reference the trash zone (see Rule 140.1.b.3).
  • Characteristics: Per Rule 711, units in the trash are evaluated based on their inherent might (the printed value), regardless of any buffs or debuffs they had while on the board.