Zirda, the Dawnwaker - Companion - Legendary

Companion — Each permanent card in your starting deck has an activated ability. (If this card is your chosen companion, you may cast it once from outside the game.) Abilities you activate that aren't mana abilities cost {2} less to activate. This effect can't reduce the mana in that cost to less than one mana. {1}, {T}: Target creature can't block this turn.