Valderia, Core Keeper

Whenever you cast an instant or sorcery spell,
put a storage counter on Valderia.
Remove X storage counters from Valderia where
X is the number of storage counters on Valderia,
Choose one:
- Draw X cards, then discard X cards.
- Valderia deals X damage to any target.
- Copy target instant or sorcery spell with
converted mana cost less than or equal to X.