Serene Master

Whenever this creature blocks, exchange its power and the power of target creature it's blocking until end of combat.

Brave the Sands

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

Masako the Humorless

Flash
Tapped creatures you control can block as though they were untapped.

Hundred-Handed One

Vigilance
{3}{W}{W}{W}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
As long as this creature is monstrous, it has reach and can block an additional ninety-nine creatures each combat.

Abu Ja'far

When this creature dies, destroy all creatures blocking or blocked by it. They can't be regenerated.