Given the cards and packs inside are nearly exactly the same, wed prefer a sealed one
Magic has had what are called "modal double-faced cards" before that allow you to cast either side from your hand, but this is the first I know of that also allows you to pay a cost to flip it while the front side is already in play - in this case, you can play Peter Parker for two mana, and then pay four more on a later turn to have him transform
Black is also a better color for this sort of threat than green, due to having better interaction
Vanquisher's Banner and Icon of Ancestry work like this, giving all your Goblins +1/+1, but the more Goblin lords you control, the more of a threat your swarm of 1/1 creeps will be
Piru, the Volatile With Piru, the Volatile around, you can opt to pay the mana and keep a 7/7 flying and lifelink dragon around, or let it die to deal 7 damage to each nonlegendary creature
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