Heat Shimmer [Double Masters] Elf Mutant {1}: Mutavault becomes a 2/2

{1}: Mutavault becomes a 2/2 creature with all creature types until end of turn

Set: Ikoria: Lair of Behemoths Type: Enchantment — Aura Rarity: Rare Cost: {5}{G}{G} Enchant creature

What these devices lacked in subtlety

Set: Amonkhet Type: Land — Forest Plains Rarity: Rare ({T}: Add {G} or {W}

or you can take one of three other actions:

Heat Shimmer [Double Masters] Elf Mutant {1}: Mutavault becomes a 2/2Set: Double Masters Type: Sorcery Rarity: Rare Cost: {2}{R} Create a token that's a copy of target creature, except it has haste and "At the beginning of the end step, exile this permanent." "Better to flare out than to gutter." Flamekin expression