Budget Alternatives to Infernal Medusa

Ogre Leadfoot $0.01 4R · Ogre Whenever this creature becomes blocked by an artifact creature, destroy that creature. Gorgon Recluse $0.06 3BB · Gorgon Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at... Sawtooth Ogre $0.08 2RR · Ogre Whenever this creature blocks or becomes blocked by a creature, this creature deals 1 damage to t... Phyrexian Slayer $0.09 3B · Phyrexian Minion Flying Serpentine Basilisk $0.09 2GG · Basilisk Whenever this creature deals combat damage to a creature, destroy that creature at end of combat. Phyrexian Reaper $0.10 4B · Phyrexian Zombie Whenever this creature becomes blocked by a green creature, destroy that creature. Deathgazer $0.11 3B · Lizard Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at... Tangle Asp $0.14 1G · Snake Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of c... Corrosive Ooze $0.14 1G · Ooze Whenever this creature blocks or becomes blocked by an equipped creature, destroy all Equipment a... Venomous Dragonfly $0.16 3G · Insect Flying Abomination $0.17 3BB · Horror Whenever this creature blocks or becomes blocked by a green or white creature, destroy that creat... Simic Basilisk $0.17 4GG · Basilisk Mutant Graft 3 Evil Eye of Urborg $0.19 4B · Eye Non-Eye creatures you control can't attack. Dread Specter $0.23 3B · Specter Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at... Cockatrice $0.35 3GG · Cockatrice Flying Stone-Cold Basilisk $0.35 4G · Basilisk Whenever this creature blocks or becomes blocked by a creature with fewer letters in its name, de... Sylvan Basilisk $0.41 3GG · Basilisk Whenever this creature becomes blocked by a creature, destroy that creature. Rock Basilisk $0.59 4RG · Basilisk Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at... Ohran Viper $1.26 1GG · Snake Whenever this creature deals combat damage to a creature, destroy that creature at end of combat.