Zirda, the Dawnwaker

Companion — Each permanent card in your starting deck has an activated ability. (If this card is your chosen companion, you may put it into your hand from outside the game for 3 as a sorcery.)
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.