Budget Alternatives to Mona Lisa, Ever Adaptable

Skywise Teachings $0.06 3U · Enchantment Whenever you cast a noncreature spell, you may pay {1}{U}. Zoo Escapees $0.07 1G · Boar Rhino When this creature leaves the battlefield, create a Mutagen token. Slithering Cryptid $0.10 2G/U · Fish Mutant When this creature enters, create a Mutagen token. Crustacean Commando $0.10 1U · Crab Mutant Soldier When this creature enters, create a Mutagen token. Return to the Sewers $0.11 3U · Instant Target creature's owner puts it on their choice of the top or bottom of their library. Spirit Cairn $0.11 2W · Enchantment Whenever a player discards a card, you may pay {W}. Mutant Chain Reaction $0.12 2G · Sorcery Destroy up to one target artifact, enchantment, or creature with flying. Goblinslide $0.22 2R · Enchantment Whenever you cast a noncreature spell, you may pay {1}. Rohgahh, Kher Keep Overlord $0.25 3BR · Kobold Warrior Other Kobolds you control get +2/+2. Michelangelo, Mutant BFF $0.28 2GG · Mutant Ninja Turtle Each creature you control with a counter on it can't be blocked by more than one creature. Emperor Mihail II $0.31 1UU · Merfolk Noble You may look at the top card of your library any time. Noosegraf Mob $0.32 4BB · Zombie This creature enters with five +1/+1 counters on it. Genghis Frog $0.32 GU · Frog Mutant Rogue Trample Saproling Infestation $0.35 1G · Enchantment Whenever a player kicks a spell, you create a 1/1 green Saproling creature token. Digsite Engineer $0.67 2W · Dwarf Artificer Whenever you cast an artifact spell, you may pay {2}. Tangleroot $0.72 3 · Artifact Whenever a player casts a creature spell, that player adds {G}.