Liberator, Urza's Battlethopter {3}
Legendary Artifact Creature — Thopter
Flash
Flying
You may cast colorless spells and artifact spells as though they had flash.
Whenever you cast a spell, if the amount of mana spent to cast that spell is greater than Liberator's power, put a +1/+1 counter on Liberator.
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Eshki, Temur's Roar 90%
$2.83#5487
"Whenever you cast a creature spell, put a +1/+1 counter on this card. If that spell's power is 4 or greater, draw a card. If that spell's power is 6 or greater, this card deals damage equal to this card's power to each opponent."
Ramos, Dragon Engine 89%
$0.41#3084
"Whenever you cast a spell, put a +1/+1 counter on this card for each of that spell's colors."
Animar, Soul of Elements 88%
$30.94#2341
"Whenever you cast a creature spell, put a +1/+1 counter on this card."
Arcbound Tracker 86%
$0.16#9582
"Whenever you cast a spell other than your first spell each turn, put a +1/+1 counter on this creature."
Gandalf the White 86%
$8.73#2733
"You may cast legendary spells and artifact spells as though they had flash."
+1 more matching line
Estinien Varlineau 86%
$0.20#10498
"Whenever you cast a noncreature spell, put a +1/+1 counter on this card. It gains flying until end of turn."
Blazing Bomb 83%
$0.14#15757
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, put a +1/+1 counter on this creature."
Kalamax, the Stormsire 83%
$0.66#9477
"Whenever you copy an instant spell, put a +1/+1 counter on this card."
Razzle-Dazzler 82%
$0.08#14652
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature. It can't be blocked this turn."
Mai and Zuko 82%
$5.32#11074
"You may cast Ally spells and artifact spells as though they had flash."
Neerdiv, Devious Diver 82%
$1.67#8280
"Whenever you cast a spell from your graveyard or activate an ability of a card in your graveyard, draw a card and put a +1/+1 counter on this card."
Thunder Drake 81%
$0.19#20416
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Illvoi Operative 81%
$0.10#19607
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Monk of the Open Hand 81%
$0.28#17221
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."
Deeproot Champion 81%
$0.27#19647
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Pyroceratops 81%
$0.19#17985
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Sprite Dragon 81%
$0.71#6032
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Tempest Angler 81%
$0.20#6904
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Spellgorger Weird 81%
$0.13#15835
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."