All you need is to survive one more of your opponents attacks so that you can untap and cast your game-winning spell
While Mirri is tapped, there's no restriction on how many creatures can attack planeswalkers you control or battles you protect
Gnarlid Colony is a serviceable two-drop if your curve calls for one, or you can wait until you have five mana and have it enter with two +1/+1 counters
Some commanders that stand out as control generals are Oloro, Ageless Ascetic, Nicol Bolas, the Ravager, and Tasigur, the Golden Fang
P/T Number 11 Language English Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pauper, Pioneer, Standard, Timeless Rulings (10/4/2004) You may tap any untapped permanents you control with the appropriate creature type (including this creature) to pay the cost of the ability, including creatures that haven't been under your control continuously since the beginning of your most recent turn.