In Mighty Party, there are some unique skills, but a lot of heroes have similar effects, and they are:

Block Block - a hero with Block Block takes reduced damage by the value of Block

Buff ATK Buff ATK - hero gets additional damage

Buff HP Buff HP - increases target's HP health

Damage Damage - deal this amount of damage based on met conditions, usually when the hero enters the board

Debuff ATK Debuff ATK - hero gets lowered his damage

Flight Flight - this hero will take damage only from Ranged heroes or other Flight heroes

Freeze Freeze - when your unit gets Frozen, it can't attack for the amount of turns it has been Frozen

Regeneration Heal - heals specific units, for example at the start of the turn or at end of the turn

Mental Shield Mental Shield - a hero with this effect takes no damage from the next attack it receives

Multi-Attack Multi-Attack - a hero attacks twice or more

Pierce Pierce - when a hero with Pierce Pierce attack an enemy, he attacks all enemies in the line, enemy heroes behind the target take Damage damage based on Pierce

Poison Poison - a hero that gets poisoned takes Damage damage at the start of every turn

Regeneration Regeneration - heal for the specified amount of health at every start of the turn

Set HP Set HP - change target's health

Silence Silence - disables all effects and buffs/debuffs on the targeted hero

Spikes Spikes - when a hero with Thorns is attacked, the attacker also takes Damage damage in return

Splash Splash - heroes around the target take additional Damage damage

Summon Summon - summons heroes or runes onto the battlefield

Steal Attack Steal Attack - lowers the attack of the target, and increases his own

Vampiric Vampiric - a hero with Vampiric deals additional damage to the target, and heals for the same amount of HP as the damage done by Vampiric (additionally Vampiric ignores the Mental Shield, meaning it can deal damage in the same attack that the Mental Shield is destroyed)