Karfell Harbinger
{1}{U}
Creature — Zombie Wizard
Oracle Text
{T}: Add {U}. Spend this mana only to foretell a card from your hand or cast an instant or sorcery spell.
Watch Out
Mana abilities don't use the stackRules Note
If this card's activated ability produces mana and doesn't target, it's a mana ability. Mana abilities resolve immediately without using the stack — opponents can't respond to them. However, abilities that target (even if they produce mana) aren't mana abilities.