Araumi of the Dead Tide + Myr Galvanizer + Palladium Myr
Araumi of the Dead Tide
Myr Galvanizer
Palladium Myr
Infinite colorless manaInfinite untap of Myr you control
How it works
Activate Araumi by tapping it and exiling cards equal to the number of opponent you have, giving Myr Galvanizer encore until end of turn.
Activate Palladium Myr by tapping it, adding CC.
Activate Myr Galvanizer's encore ability by paying 3 and exiling it from your graveyard, creating a token copy of it with haste for each opponent you have.
Activate a Myr Galvanizer token by paying 1 and tapping it, untapping all other Myr you control.