Highland Berserker [Zendikar] Hydra Dog you may pay {0} rather

you may pay {0} rather than pay the mana cost for a spell you cast with mana value X or less

A snake in the grasp

Set: Ice Age Type: Creature — Zombie Rarity: Rare Cost: {3}{B}{B} At end of combat

{3}{W/B}{W/B}{W/B}: If Warden of the First Tree is a Spirit

"This was quite possibly the least pleasant occurrence on the entire expedition

Highland Berserker [Zendikar] Hydra Dog you may pay {0} ratherSet: Zendikar Type: Creature Human Berserker Ally Rarity: Common Cost: {1}{R} Whenever Highland Berserker or another Ally enters the battlefield under your control, you may have Ally creatures you control gain first strike until end of turn. He gets paid by the axe.