Tezzeret, Betrayer of Flesh 
Legendary Planeswalker — Tezzeret
$0.46 #3960 0.30 4.5 years
The first activated ability of an artifact you activate each turn costs less to activate.
less to activate.+1: Draw two cards. Then discard two cards unless you discard an artifact card.
−2: Target artifact becomes an artifact creature. If it isn't a Vehicle, it has base power and toughness 4/4.
−6: You get an emblem with "Whenever an artifact you control becomes tapped, draw a card."
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Cards similar to Tezzeret, Betrayer of Flesh expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Forensic Gadgeteer80%
$1.83↑#1391↑0.302.6 years↓
"Activated abilities of artifacts you control cost 
less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."+1 more matching line
Mutagen Man, Living Ooze80%
$1.74↑#6510↓0.00↓0.5 years↓
"Activated abilities of artifact tokens you control cost less to activate."
less to activate."
Biomancer's Familiar78%
$1.87↑#3144↑0.307.6 years↑
"Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Training Grounds76%
$8.21↑#1049↑0.46↑16.4 years↑
"Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Heartstone76%
$1.63↑#38890.2128.5 years↑
"Activated abilities of creatures cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Doc Ock, Evil Inventor75%
$0.52↑#17792↓0.40↑0.9 years↓
"At the beginning of combat on your turn, target noncreature artifact you control becomes an 8/8 Robot Villain artifact creature in addition to its other types."
Iron Man, Futurist Paragon74%
$1.91↑#17954↓0.00↓0.2 years↓
"At the beginning of combat on your turn, target artifact or creature becomes an artifact creature with base power and toughness 5/5 and gains flying."
Professor Hojo74%
$0.22↓#5246↓0.321.2 years↓
"The first activated ability you activate during your turn that targets a creature you control costs less to activate."
less to activate."+1 more matching line
Tezzeret, Agent of Bolas73%
$3.76↑#14257↓0.44↑15.6 years↑
"−1: Target artifact becomes an artifact creature with base power and toughness 5/5."
Mind Transfer Protocol73%
$0.12↓#20760↓0.00↓0.5 years↓
"Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/5."
Alpharael, Dreaming Acolyte73%
$0.16↓#19740↓0.211.1 years↓
"When this card enters, draw two cards. Then discard two cards unless you discard an artifact card."
Power Artifact73%
$184.08↑#9668↓0.47↑32.5 years↑
"Enchanted artifact's activated abilities cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Thirst for Knowledge72%
$0.13↓#2028↑0.09↓22.9 years↑
"Draw three cards. Then discard two cards unless you discard an artifact card."
Zirda, the Dawnwaker72%
$1.88↑#33080.49↑6.4 years↑
"Abilities you activate that aren't mana abilities cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Alloy Animist72%
$0.16↓#22818↓0.00↓3.8 years
"
: Until end of turn, target noncreature artifact you control becomes a 4/4 artifact creature."
: Until end of turn, target noncreature artifact you control becomes a 4/4 artifact creature."
Fallowsage71%
$0.29↓#9941↓0.04↓18.9 years↑
"Whenever this creature becomes tapped, you may draw a card."
Magus of the Bazaar71%
$0.36↓#13378↓0.12↓19.6 years↑
"
: Draw two cards, then discard three cards."
: Draw two cards, then discard three cards."
Oko, Thief of Crowns70%
$4.82↑#2110↑1.71↑6.9 years↑
"+1: Target artifact or creature loses all abilities and becomes a green Elk creature with base power and toughness 3/3."
Facet Reader70%
$0.08↓#23335↓0.00↓6.4 years↑
", : Draw a card, then discard a card."
, : Draw a card, then discard a card."
Dragonborn Looter70%
$0.21↓#12748↓0.07↓4.2 years
", : Draw a card, then discard a card."
, : Draw a card, then discard a card."