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}, : Target creature can't block this turn.