This might be a silly question, but well, I'm still pretty new.
The situtation is I have Rakdos, Lord of Riots on the battlefield, with and want to cast a creature with an "X" in the casting cost. Let's say Lightning Serpent . Assuming Rakdos has already attacked and connected with all 6 damage, can I use his ability and automatically put a 6 mana discount toward the X of the Lightning Serpent? I can't think of a reason why I couldn't, but that just seems kind of powerful. I guess I'm just confirming that that is ok.
X in costs are affected by cost reduction effects, yes. If your opponent lost 6 life this turn, you essentially can choose an X up to 6 without having to pay anything for it.
total cost = mana cost or alternative cost + additional costs and cost increases - cost reductions
The mana cost is X.
Rakdos's effect is a cost reduction.
Say your opponent lost 6 life and you picked X=6.
= mana cost or alternative cost + additional costs and cost increases - cost reductions
= + [nothing] -
WARNING: not related to rules.
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