mtg black proliferate cards Yawgmoth Thran Physician Altered Full Art Magic Commander EDH Signed Pimp Birthday Gift Present Phyrexia Legendary Black mana sources that can

He's already been banned in Commander, for goodness' sake

Kronk - Head of Security has a very high summoning cost of 7 Ink, but he has Strength and Willpower stats of 6 each

However, that is an easy trade for the other part of the ability, which is a tutor effect for a creature with mana value 1 or less

Instant is all well and good but most of the time you need to use your mana to not be getting brutally killed so you only ever really get to cast it before turn seven if one of you is misfiring badly

I personally do not like the card a ton, as it does not generate very interesting games in my opinion

That's 13 cards in your Shalai and Hallar deck that win the game on the spot if you can gain a single life or deal a single damage