Elvish Bard

All creatures able to block Elvish Bard do so.

Lure

Enchant creature
All creatures able to block enchanted creature do so.

Fight to the Death

Destroy all blocking creatures and all blocked creatures.

Nemesis Mask

All creatures able to block equipped creature do so.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery. This card enters unattached and stays on the battlefield if the creature leaves.)

Benefactor's Draught

Untap all creatures. Until end of turn, whenever a creature an opponent controls blocks, draw a card.
Draw a card.

Declare Dominance

Target creature gets +3/+3 until end of turn. All creatures able to block it this turn do so.

Venomous Breath

Choose target creature. At this turn's next end of combat, destroy all creatures that blocked or were blocked by it this turn.

Alluring Scent

All creatures able to block target creature this turn do so.

Abu Ja'far

When Abu Ja'far dies, destroy all creatures blocking or blocked by it. They can't be regenerated.

Coils of the Medusa

Enchant creature
Enchanted creature gets +1/-1.
Sacrifice Coils of the Medusa: Destroy all non-Wall creatures blocking enchanted creature.

Gaze of the Gorgon

({B/G} can be paid with either {B} or {G}.)
Regenerate target creature. At this turn's next end of combat, destroy all creatures that blocked or were blocked by it this turn.

Revenge of the Hunted

Until end of turn, target creature gets +6/+6 and gains trample, and all creatures able to block it this turn do so.
Miracle {G} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Bloodscent

Kjeldoran Frostbeast

At end of combat, destroy all creatures blocking or blocked by Kjeldoran Frostbeast.

Evil Eye of Urborg

Non-Eye creatures you control can't attack.
Whenever Evil Eye of Urborg becomes blocked by a creature, destroy that creature.

Joven's Ferrets

Whenever Joven's Ferrets attacks, it gets +0/+2 until end of turn.
At end of combat, tap all creatures that blocked Joven's Ferrets this turn. They don't untap during their controller's next untap step.

Golgari Decoy

All creatures able to block Golgari Decoy do so.
Scavenge {3}{G}{G} ({3}{G}{G}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)