Palace Guard

Palace Guard can block any number of creatures.

Vraska, Swarm's Eminence

Whenever a creature you control with deathtouch deals damage to a player or planeswalker, put a +1/+1 counter on that creature.
−2: Create a 1/1 black Assassin creature token with deathtouch and "Whenever this creature deals damage to a planeswalker, destroy that planeswalker."

High Ground

Each creature you control can block an additional creature each combat.

Basilisk Collar

Equipped creature has deathtouch and lifelink.
Equip {2}

Cenn's Tactician

{W}, {T}: Put a +1/+1 counter on target Soldier creature.
Each creature you control with a +1/+1 counter on it can block an additional creature each combat.

Valor Made Real

Target creature can block any number of creatures this turn.

Deathless Angel

Flying
{W}{W}: Target creature gains indestructible until end of turn.

Brave the Sands

Creatures you control have vigilance.
Each creature you control can block an additional creature each combat.

Colossus of Akros

Defender, indestructible
{10}: Monstrosity 10. (If this creature isn't monstrous, put ten +1/+1 counters on it and it becomes monstrous.)
As long as Colossus of Akros is monstrous, it has trample and can attack as though it didn't have defender.

Archetype of Courage

Creatures you control have first strike.
Creatures your opponents control lose first strike and can't have or gain first strike.

Dauntless Escort

Sacrifice Dauntless Escort: Creatures you control gain indestructible until end of turn.