Koth's Molten Core

As an additional cost to cast Koth's Molten Core, choose one or more —
• Pay X life and {x}.
• Pay X life and sacrifice X permanents.
• Pay X life and discard X cards.
When you cast this spell, copy it for each mode
chosen beyond the first. You may choose new
targets for the copies.
Koth's Molten Core deals X damage to any target.