Zimone, Infinite Analyst + Mana Drain interaction?
Hi, so I have Zimone, Infinite Analyst out with 3x 1+/+1 counters on her. I also have 5 mana. I cast a creature with 1 Green, 1 Blue and X. I use Zimone's ability to cast this creature with 1 Blue, 1 Green and X = 6 (3 remaining mana + Zimone's counters).
My opponent counters the spell with Mana Drain, do they get 5 mana or 8 mana