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The card itself was released in the S Promo set and features Bulbasaur using Vinewhip to swing between two trees
In particular, you can't cast this fast enough to stop a creature's "At the beginning of your upkeep" or "When this creature enters the battlefield" abilities from triggering
I expect Foul Emissary to become an unheralded Standard staple like Lambholt Pacifist
Halana and Alena are a huge target and likely wont stick around for long on the battlefield, but if youre able to untap with them and play another creature after them, that creature gets an upgrade
You dont get a discount on the creatures you recast so this isnt a reanimation commander, but it exploits cheap threats like Inti, Seneschal of the Sun and Fable of the Mirror-Breaker for a grindy midrange strategy