Warden of the Inner Sky 
Creature — Human Soldier
$0.35 #15455 0.12 2.9 years
As long as this creature has three or more counters on it, it has flying and vigilance.
Tap three untapped artifacts and/or creatures you control: Put a +1/+1 counter on this creature. Scry 1. Activate only as a sorcery.
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Adaptive Gemguard86%
$0.10↓#20898↓0.042.9 years
"Tap two untapped artifacts and/or creatures you control: Put a +1/+1 counter on this creature. Activate only as a sorcery."
Voice of the Blessed82%
$0.97↑#2976↑0.164.9 years↑
"As long as this creature has four or more +1/+1 counters on it, it has flying and vigilance."
Tenured Tethermage76%
$0.31↓#174570.100.0 years↓
"Tap two untapped artifacts you control: Put two +1/+1 counters on this creature."
Saheeli, Filigree Master74%
$0.95↑#9635↑0.113.9 years
"+1: Scry 1. You may tap an untapped artifact you control. If you do, draw a card."
Angelic Cub73%
$0.30↓#158860.00↓3.9 years
"As long as this creature has three or more +1/+1 counters on it, it has flying."
Lightwalker72%
$0.02↓#27707↓0.0511.6 years↑
"This creature has flying as long as it has a +1/+1 counter on it."
Foggy Swamp Vinebender72%
$0.11↓#173340.040.9 years↓
"Waterbend
: Put a +1/+1 counter on this creature. Activate only during your turn."
Essence Channeler71%
$0.42↑#4089↑0.192.2 years
"As long as you've lost life this turn, this creature has flying and vigilance."
Living Conundrum70%
$0.21↓#182690.062.7 years
"As long as there are no cards in your library, this creature has base power and toughness 10/10 and has flying and vigilance."