Frenzied Goblin
{R}
Creature -- Goblin Berserker
1/1
Whenever ~this~ attacks, you may pay {R}. If you do, target creature can't block this turn.
Intimidator Initiate
{R}
Creature -- Goblin Shaman
1/1
Whenever a player casts a red spell, you may pay {1}. If you do, target creature can't block this turn.
Maulfist Doorbuster
{3}{R}
Creature -- Human Warrior
4/2
When ~this~ enters, you get {e}{e} (two energy counters).
Whenever ~this~ attacks, you may pay {e}. If you do, target creature can't block this turn.