Magical goblin of dementiaDark Confidant Buy + Harmonic Sliver Buy + Altar of Dementia Buy
Cards from Modern Horizon :
Dark confidant stands for Putrid Goblin : 2/2 w/ persist.
Harmonic sliver is Good-fortune Unicorn : who gives +1/+1 counter on other creatures entering the field.
And there's Altar of dementia for your sac engine.
Sac the Putrid Gob to the Altar. The Putrin gob comes back w/ persist and has a +1/+1 counter from the unicorn. Make target player mill 2 cards. Rince and repeat. Have fun at your prerelease with these 2 combos!
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