The basic combo is to play a Merlin, quest with Arthur to return a Madam Mim to your hand, then play Madam Mim to return Merlin to your hand
While green decks hardly lack options for +1/+1 counter production, you really need counter doublers to outspeed your opponents and build up a terrifying board

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Get that hairy rump out into the sun, friend
This fuels its GX move, Hot Burn, which does 50 damage, times the amount of Fire energies attached to the Pokmon
7 Sword Of Truth And Justice The Mirran Sword cycle gives each color pairing an impressive set of skills that activate when the equipped creature deals damage to a player