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In Modern it could deal some serious damage to already-fragile mana-bases and possibly give land destruction a way to return to prominence (so long as it cant be supported in Standard)

The Best Dance of the Elements Precon Upgrade Guide

Introducing Red cards

If you hold out in hopes of selling a raw card at a higher price down the road, you may end up taking a heavy loss if it doesnt possess the rarity to continually appreciate in value

change its ATK to 0, and if you do, Special Summon this card, then take damage equal to that monster's original ATK

Purphoros just says 20 creatures = game over, which token decks can easily achieve