Wrenn and Realmbreaker {1}{G}{G}
Legendary Planeswalker — Wrenn
Lands you control have "{T}: Add one mana of any color."
+1: Up to one target land you control becomes a 3/3 Elemental creature with vigilance, hexproof, and haste until your next turn. It's still a land.
−2: Mill three cards. You may put a permanent card from among the milled cards into your hand.
−7: You get an emblem with "You may play lands and cast permanent spells from your graveyard."
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Cards that do something similar expected a card that isn't here?
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Oko, Lorwyn Liege // Oko, Shadowmoor Scion 99%
$0.81#13797
"−1: Mill three cards. You may put a permanent card from among them into your hand."
Greenhouse // Rickety Gazebo 100%
$0.22#6609
"Lands you control have "{T}: Add one mana of any color.""
+1 more matching line
Mystic Skull // Mystic Monstrosity 100%
$0.14#16293
"Lands you control have "{T}: Add one mana of any color.""
Dune Chanter 100%
$2.47#5928
"Lands you control have "{T}: Add one mana of any color.""
+2 more matching lines
The World Tree 87%
$5.67#801
"As long as you control six or more lands, lands you control have "{T}: Add one mana of any color.""
Resonating Lute 85%
$1.53#3793
"Lands you control have "{T}: Add two mana of any one color. Spend this mana only to cast instant and sorcery spells.""
Divergent Growth 80%
$0.13#26224
"Until end of turn, lands you control gain "{T}: Add one mana of any color.""