Aisling Leprechaun 
Creature — Faerie
$0.65 #30211 0.13 32.4 years
Whenever this creature blocks or becomes blocked by a creature, that creature becomes green. (This effect lasts indefinitely.)
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Dream Fighter77%
$0.06↓#277610.1830.0 years↓
"Whenever this creature blocks or becomes blocked by a creature, this creature and that creature phase out."
Cleric of Chill Depths76%
$0.21↓#23606↑0.156.1 years↓
"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
Labyrinth Minotaur76%
$0.11↓#304640.33↑31.1 years↓
"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
Abomination75%
$0.19↓#262780.2032.4 years
"Whenever this creature blocks or becomes blocked by a green or white creature, destroy that creature at end of combat."
Wall of Frost74%
$0.20↓#4932↑0.67↑17.3 years↓
"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
Serra Inquisitors74%
$0.18↓#316650.00↓31.1 years↓
"Whenever this creature blocks or becomes blocked by one or more black creatures, this creature gets +2/+0 until end of turn."
Lim-Dûl's Cohort74%
$0.19↓#317500.00↓31.4 years↓
"Whenever this creature blocks or becomes blocked by a creature, that creature can't be regenerated this turn."
Viashino Weaponsmith74%
$0.17↓#316140.00↓28.0 years↓
"Whenever this creature becomes blocked by a creature, this creature gets +2/+2 until end of turn."
Spitting Slug74%
$0.31↓#319040.00↓32.2 years
"Whenever this creature blocks or becomes blocked, you may pay 
. If you do, this creature gains first strike until end of turn. Otherwise, each creature blocking or blocked by this creature gains first strike until end of turn."
. If you do, this creature gains first strike until end of turn. Otherwise, each creature blocking or blocked by this creature gains first strike until end of turn."
Raging Gorilla73%
$0.17↓#20470↑0.00↓29.7 years↓
"Whenever this creature blocks or becomes blocked, it gets +2/-2 until end of turn."
Deathgazer72%
$0.07↓#271050.0927.0 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Dread Specter72%
$0.19↓#309650.1830.0 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Inferno Elemental72%
$0.08↓#295310.0417.3 years↓
"Whenever this creature blocks or becomes blocked by a creature, this creature deals 3 damage to that creature."
Ageless Sentinels71%
$0.28↓#266350.00↓23.4 years↓
"When this creature blocks, it becomes a Bird Giant, and it loses defender."
Ghost Hounds71%
$0.15↓#299790.0731.1 years↓
"Whenever this creature blocks or becomes blocked by a white creature, this creature gains first strike until end of turn."
Brimaz, King of Oreskos71%
$7.04↑#3037↑0.24↑12.7 years↓
"Whenever this card blocks a creature, create a 1/1 white Cat Soldier creature token with vigilance that's blocking that creature."
Mindbender Spores71%
$1.42↑#22216↑0.63↑30.0 years↓
"Whenever this creature blocks a creature, put four fungus counters on that creature. The creature gains "This creature doesn't untap during your untap step if it has a fungus counter on it" and "At the beginning of your upkeep, remove a fungus counter from this creature.""
Ashmouth Hound70%
$0.05↓#23093↑0.00↓15.1 years↓
"Whenever this creature blocks or becomes blocked by a creature, this creature deals 1 damage to that creature."
Ornery Goblin70%
$0.10↓#22414↑0.108.0 years↓
"Whenever this creature blocks or becomes blocked by a creature, this creature deals 1 damage to that creature."
Venomous Dragonfly70%
$0.16↓#284140.00↓27.0 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."