For a single green mana, a creature becomes a 6/4 until end of turn
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Purpose-driven, this archetype cares little for what the opponent is doing as long as it's not Leyline of Sanctity or similar spells, and its primary concern is fighting the top of its own deck
For example, if you control 3 Frog monsters and your opponent attacks Flip Flop Frog, you can return 3 monsters that your opponent controls potentially leaving them with an empty field
Thats what Foundations was, after alla functional return to the Core Sets of yesteryear that focused on simple cards to onboard new players