Comet Storm, however, has a mana value of 2 in exile and can be flipped off cascade, but if you cast it, X always equals 0
Liliana's ultimate ability gives her controller an emblem that puts X 2/2 black Zombie creature tokens onto the battlefield, where X is the number of Zombies plus two under the players control
They look for the essentials: dependable mana, steady card draw, and efficient answers to threats
In older formats like Pioneer or Modern, youd be accelerating to this card via Llanowar Elves and similar mana creatures, but thats actually a fairly weak thing to do because youre likely not in search of more lands via its [+1] (I imagine you want more real cards, not lands), you dont have any interest in putting more lands on the battlefield because youre likely skimping on them for mana creatures in the first place, and if youre accelerating to Wrenn and Seven via mana creatures, its [-3] is making a 3/3 Treefolk I guess