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Thats good enough to hang around the bottom of this list, and its only up from here

When it's defeated, exile it, then cast it transformed.) When Invasion of Regatha enters the battlefield, it deals 4 damage to another target battle or opponent and 1 damage to up to one target creature

If there's a cost associated with having it attack, its controller isn't forced to pay that cost, so it doesn't have to attack in that case either

While trying to think of things that were host or augment-like, I realized we had a brand-new mechanic coming up in Ikoria: Lair of Behemoths that fit the bill, something called mutate