Merieke Commander

Use Merieke to steal the best creatures from the enemy and use them against him, or simple use her to destroy his creatures.
Blink enemy creatures under your control to gain permanent control.
Try not to blink Merieke (summoning sickness), rather try to untap her.
With her cheap CMC she can be put into her owner's hand or played from the graveyard.
Use Hex Parasite and Vampire Hexmage to remove counter from enemy permanents and from Dark Depths.
Use the Ring of Evos Isle on several creatures to put a counter on them, proliferate.
Use Sun Titan to ramp and regain creatures.
Use Dimir Guard only as tutor for Mist Raven (instead of Aether Adept), Skinrender, Archaeomancer, Clone, Chester's Cap and all other 4-CMC cards.

Sideboard (ideas):
One idea is to force all permanents to be tapped, aka skip untap phase and untap manually with spells/auras/... while the enemy has no such possibility.
Umbral Mantle on Merieke should create a funny finisher with enough mana: steal and destroy creatures while giving her +2/+2 and then attack with her.