Even if you dont have the mana immediately, you have until the end of your next turn to do so
I will say, eventually, there will be a critical mass of good mana dorks which require spot removal, allowing the deck to consistently have a combo kill on turn three or four
Rendmaw, Creaking Nest Every time Rendmaw, Creaking Nest enters the battlefield, or when you cast a card with multiple card types, each player gets a tapped 2/2 bird
If that player controlled any permanents owned by another player, the effects that gave control of them to the player who left end
Fellwar Stones will turn into a magical Christmas manarock with absolutely no drawback
The main downside of Primal Groudon- EX is how long it takes to power up its attack, but Mega Turbo ( XYRoaring Skies , 86/108) can accelerate the process