Kyuubi

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 eftect can't reduce the mana in that cost to less than one mana.

{1}{t}: Target creature can't block this turn.