Quirion Dryad 

Creature — Dryad
$0.10 #25014 0.35 25.6 years
Whenever you cast a spell that's white, blue, black, or red, put a +1/+1 counter on this creature.
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Questing Druid // Seek the Beast96%
$0.36↑#8502↑0.333.0 years↓
"Whenever you cast a spell that's white, blue, black, or red, put a +1/+1 counter on this creature."
God-Pharaoh's Faithful89%
$0.18↑#208270.00↓9.1 years↓
"Whenever you cast a blue, black, or red spell, you gain 1 life."
Emberstrike Duo81%
$0.10#299950.2718.3 years↓
"Whenever you cast a black spell, this creature gets +1/+1 until end of turn."
Thistledown Duo78%
$0.08↓#30457↓0.07↓18.3 years↓
"Whenever you cast a white spell, this creature gets +1/+1 until end of turn."
Runaway Steam-Kin77%
$1.40↑#1661↑0.397.9 years↓
"Whenever you cast a red spell, if this creature has fewer than three +1/+1 counters on it, put a +1/+1 counter on this creature."
Riverfall Mimic76%
$0.12↑#31446↓0.00↓18.1 years↓
"Whenever you cast a spell that's both blue and red, this creature has base power and toughness 3/3 until end of turn and can't be blocked this turn."
Gravelgill Duo75%
$0.09↓#296960.3818.3 years↓
"Whenever you cast a blue spell, this creature gets +1/+1 until end of turn."
Mountain Titan75%
$0.59↑#31691↓0.07↓31.3 years↑
"

: Until end of turn, whenever you cast a black spell, put a +1/+1 counter on this creature."
Minotaur Tactician75%
$0.06↓#31871↓0.00↓25.3 years
"This creature gets +1/+1 as long as you control a white creature."
Nightsky Mimic74%
$0.18↑#30320↓0.18↓18.1 years↓
"Whenever you cast a spell that's both white and black, this creature has base power and toughness 4/4 until end of turn and gains flying until end of turn."
Battlegate Mimic74%
$0.09↓#261210.00↓18.1 years↓
"Whenever you cast a spell that's both red and white, this creature has base power and toughness 4/2 until end of turn and gains first strike until end of turn."
Battle Brawler74%
$0.14↑#246070.2911.6 years↓
"As long as you control a red or white permanent, this creature gets +1/+0 and has first strike."
K'rrik, Son of Yawgmoth74%
$0.86↑#1071↑1.28↑7.0 years↓
"Whenever you cast a black spell, put a +1/+1 counter on this card."
Bloodhall Ooze74%
$0.52↑#214930.07↓17.6 years↓
"At the beginning of your upkeep, if you control a black permanent, you may put a +1/+1 counter on this creature."
Aragorn, the Uniter74%
$6.33↑#3360↑0.75↑3.2 years↓
"Whenever you cast a white spell, create a 1/1 white Human Soldier creature token."
Zuko, Avatar Hunter72%
$0.59↑#13461↑0.00↓0.8 years↓
"Whenever you cast a red spell, create a 2/2 red Soldier creature token."
Dega Sanctuary72%
$0.22↑#272100.13↓25.3 years
"At the beginning of your upkeep, if you control a black or red permanent, you gain 2 life. If you control a black permanent and a red permanent, you gain 4 life instead."
Ardbert, Warrior of Darkness71%
$0.33↑#4981↑0.421.2 years↓
"Whenever you cast a white spell, put a +1/+1 counter on each legendary creature you control. They gain vigilance until end of turn."
Mage Tower Referee70%
$0.06↓#238100.00↓0.4 years↓
"Whenever you cast a multicolored spell, put a +1/+1 counter on this creature."