Combined with how significantly the timing of the spell can alter its impact, you get the broadest delta of possible effectiveness among all mechanics
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While this is already quite useful, whenever Zaxara's controller casts a spell with X in its mana cost, they create a 0/0 hydra with X +1/+1 counters on it, often making X-based spells much more effective
Thats only for PC players
[card]Wurmcoil Engine[/card] and [card]Batterskull[/card] give the deck staying power, stabilizing against creature-heavy strategies with lifelink while also being difficult to remove cleanly
Its perfect to swing with an opponents best threat or combo with cards like Kiki-Jiki, Mirror Breaker