Mizzix's Mastery [Mystery Booster] Paupercommander Thassa isn't a creature

Thassa isn't a creature

Set: Portal Three Kingdoms Type: Legendary Creature — Human Soldier Rarity: Rare Cost: {3}{U}{U} Horsemanship (This creature can't be blocked except by creatures with horsemanship

Little Buddy can be destroyed

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {3}{U}{U} You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost

But if you choose death instead

Mizzix's Mastery [Mystery Booster] Paupercommander Thassa isn't a creatureSet: Mystery Booster Type: Sorcery Rarity: Rare Cost: {3}{R} Exile target card that's an instant or sorcery from your graveyard. For each card exiled this way, copy it, and you may cast the copy without paying its mana cost. Exile Mizzix's Mastery. Overload {5}{R}{R}{R} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")