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With Shang-Chi, you could trigger something likeKarametra's Acolyte, activate Temur Sabertooth, and create an infinite ETB loop that just keeps piling up green mana

2: Gain control of target creature

Eldrazi Conscription If you dont have a handy Eldrazi titan to hand, you can always create your own

Mirror EntityMirror Entity, as referenced above, can activate its ability for X = 0 for an over-easy Mass PolymorphMass Polymorph for your board

This Red Sorcery-speed spell turns all of your Vehicles into Creatures until the end of the turn, and all of your Creatures get a +2/+0 buff until the end of the turn

Just look at Fatal Push