Finale of Devastation 
Sorcery
$29.92 #313 1.13 7.3 years
Search your library and/or graveyard for a creature card with mana value X or less and put it onto the battlefield. If you search your library this way, shuffle. If X is 10 or more, creatures you control get +X/+X and gain haste until end of turn.
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Vision Quest77%
$0.36↓#16788↓0.00↓0.2 years↓
"Search your library and/or graveyard for an artifact creature card with mana value X or less and put it onto the battlefield with X additional +1/+1 counters on it. If X is 4 or greater, it gains haste until end of turn. If you search your library this way, shuffle."
The Hunger Tide Rises76%
$0.25↓#8924↓0.06↓2.2 years↓
"Sacrifice any number of creatures. Search your library and/or graveyard for a creature card with mana value less than or equal to the number of creatures sacrificed this way and put it onto the battlefield. If you search your library this way, shuffle."
Chord of Calling76%
$5.82↓#522↓0.72↓20.9 years↑
"Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."
Nature's Rhythm76%
$3.72↓#924↓0.44↓1.4 years↓
"Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."
Protean Hulk74%
$5.48↓#2524↓1.23↑20.3 years↑
"When this creature dies, search your library for any number of creature cards with total mana value 6 or less, put them onto the battlefield, then shuffle."
Rocco, Cabaretti Caterer72%
$0.19↓#5948↓0.61↓4.4 years↓
"When this card enters, if you cast it, you may search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."
Neoform71%
$1.41↓#2268↓0.45↓7.3 years
"Search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put that card onto the battlefield with an additional +1/+1 counter on it, then shuffle."
Yisan, the Wanderer Bard71%
$0.31↓#8071↓0.14↓12.1 years↑
"
, 
, Put a verse counter on this card: Search your library for a creature card with mana value equal to the number of verse counters on this card, put it onto the battlefield, then shuffle."
, , Put a verse counter on this card: Search your library for a creature card with mana value equal to the number of verse counters on this card, put it onto the battlefield, then shuffle."