main phase, attack, as Storm Elemental will die on the next turn anyways. You could also return it to your hand if you have Orb of Fluidity or King Matsu. You can also wait until the opponent doesn't have any allies left to attack with this, or just bypass everything by pairing it with Sacrificial Altar.
Strong against: other strong allies, as well as extremely weak allies.
Weak against: strong allies (yes, it's a paradox-- Storm will eliminate the other ally and die in the process, both hurting and helping)
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