Guilds of Ravnica

Fire Urchin | Creature | Elemental | Trample Whenever you cast an instant or sorcery spell, Fire Urchin gets +1/+0 until end of turn. | Deruchenko Alexander

Goblin Locksmith | Creature | Goblin Rogue | Whenever Goblin Locksmith attacks, creatures with defender can't block this turn. | Mark Behm

Maniacal Rage | Enchantment | Aura | Enchant creature Enchanted creature gets +2/+2 and can't block. | Heonhwa Choe

Ornery Goblin | Creature | Goblin Warrior | Whenever Ornery Goblin blocks or becomes blocked by a creature, Ornery Goblin deals 1 damage to that creature. | Johann Bodin

Sure Strike | Instant | | Target creature gets +3/+0 and gains first strike until end of turn. | Steve Argyle

Fresh-Faced Recruit | Creature | Human Soldier | As long as it's your turn, Fresh-Faced Recruit has first strike. | Anthony Palumbo

Goblin Electromancer | Creature | Goblin Wizard | Instant and sorcery spells you cast cost {1} less to cast. | Svetlin Velinov