Trample
Whenever you cast an instant or sorcery spell, Erratic Cyclops gets +X/+0 until end of turn, where X is that spell's mana value.
Erratic Cyclops’s triggered ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
If a spell has {X} in its mana cost, include the value chosen for that X when determining the mana value of that spell.