In terms of casting cost, I'm trying to understand how Hungering Hydra interacts with Goreclaw, Terror of Qal Sisma ability; "creature spells you cast with power 4 or greater cost 2 less to cast."
How much mana would it cost to cast Hydra as a 4/4 if I have Goreclaw out?
If X is 4, Hungering Hydra will cost {4}{G}, despite Goreclaw.
For purposes of Goreclaw, Hungering Hydra on the stack has power 0 regardless of the value of X for it. Hungering Hydra is given counters due to its first ability only as it enters the battlefield, and not while it's being cast.
However, the value of X will affect Hungering Hydra's mana value on the stack (C.R. 202.3e); compare Goreclaw with Krosan Drover.
How much mana would it cost to cast Hydra as a 4/4 if I have Goreclaw out?
For purposes of Goreclaw, Hungering Hydra on the stack has power 0 regardless of the value of X for it. Hungering Hydra is given counters due to its first ability only as it enters the battlefield, and not while it's being cast.
However, the value of X will affect Hungering Hydra's mana value on the stack (C.R. 202.3e); compare Goreclaw with Krosan Drover.