Mutagen Man, Living Ooze {X}{G}{G}
Legendary Creature — Ooze Mutant
Trample
Activated abilities of artifact tokens you control cost {1} less to activate.
When Mutagen Man enters, create X Mutagen tokens. (They're artifacts with "{1}, {T}, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")
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Cards that do something similar expected a card that isn't here?
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Forensic Gadgeteer 91%
$1.50#1374
"Activated abilities of artifacts you control cost {1} less to activate. This effect can't reduce the mana in that cost to less than one mana."
Tezzeret, Betrayer of Flesh 80%
$0.43#3819
"The first activated ability of an artifact you activate each turn costs {2} less to activate."