mtg commander meren deck Ultra PRO: Box - PRO 100+ (Commander 2015 you get an experience counter Meren of Clan Nel Toth

Morska is quite versatile and very synergistic

Lead with Gisa and Geralf ($0.37) and lean on cards that cost less than a coffee: Lords: Diregraf Captain ($0.44), Cemetery Reaper ($0.46), Undead Warchief, Lord of the Accursed

For example, the difference between the power and toughness of a 3/5 creature is 2

"Using Field Experiments to Test Equivalence between Auction Formats: Magic on the Internet" (PDF)

The ring tempt opportunities are limited as are the ramp options among Grixis cards, but otherwise it makes a very strong control deck in Commander

I dont know many two-mana commanders that can deal 33 damage on turn two as consistently