Three-Headed Goblin

Triple strike (This creature deals first-strike, regular, and last-strike combat damage.)

Extremely Slow Zombie

Last strike (This creature deals combat damage after creatures without last strike.)

Critical Hit

Target creature gains double strike until end of turn.
When you roll a natural 20, return Critical Hit from your graveyard to your hand. (A natural 20 is a roll that displays 20 on the die.)

Garbage Elemental

Last strike (This creature deals combat damage after creatures without last strike.)
Battalion — Whenever Garbage Elemental and at least two other creatures attack, target creature can't block this turn.

Blade Historian

Attacking creatures you control have double strike.

Double Cleave

Target creature gains double strike until end of turn. (It deals both first-strike and regular combat damage.)