Prior to patch 4.15 If you selected to attack your target prior to using Headbutt, Alistar would automatically and immediately attack after colliding with almost no attack wind-up. This interaction made spellblade items particularly potent on Alistar however this was removed because the opponent had no way to retaliate.
COST: 40 / 50 / 60 / 70 / 80 mana
Active: Alistar heals himself, with nearby allies healing for half that amount. Triumphant Roar's cooldown is reduced by 2 seconds whenever a nearby enemy unit dies.