Serpentine Ambush 
Instant
$0.12 #18736 0.00 4.9 years
Until end of turn, target creature becomes a blue Serpent with base power and toughness 5/5.
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Startling Development98%
$0.10↓#217160.006.5 years↑
"Until end of turn, target creature becomes a blue Serpent with base power and toughness 4/4."
Fractalize94%
$0.21↑#186260.020.5 years↓
"Until end of turn, target creature becomes a green and blue Fractal with base power and toughness each equal to X plus 1."
Dance of the Skywise91%
$0.15↑#28464↓0.14↑11.6 years↑
"Until end of turn, target creature you control becomes a blue Dragon Illusion with base power and toughness 4/4, loses all abilities, and gains flying."
Mercurial Transformation90%
$0.27↑#175700.065.5 years
"Until end of turn, target nonland permanent loses all abilities and becomes your choice of a blue Frog creature with base power and toughness 1/1 or a blue Octopus creature with base power and toughness 4/4."
Scale Up90%
$0.38↑#7133↑0.077.4 years↑
"Until end of turn, target creature you control becomes a green Wurm with base power and toughness 6/4."
Dragonshift90%
$0.17↑#215340.11↑13.5 years↑
"Until end of turn, target creature you control becomes a blue and red Dragon with base power and toughness 4/4, loses all abilities, and gains flying."
Turn to Frog89%
$0.18↑#9066↑0.29↑15.3 years↑
"Until end of turn, target creature loses all abilities and becomes a blue Frog with base power and toughness 1/1."
Snakeform89%
$0.16↑#202450.38↑18.2 years↑
"Until end of turn, target creature loses all abilities and becomes a green Snake with base power and toughness 1/1."
Metamorphic Blast87%
$0.23↑#14175↑0.19↑2.5 years↓
"+ — Until end of turn, target creature becomes a white Rabbit with base power and toughness 0/1."
— Until end of turn, target creature becomes a white Rabbit with base power and toughness 0/1."
Phantasmal Form86%
$0.06↓#24986↓0.36↑7.4 years↑
"Until end of turn, up to two target creatures each have base power and toughness 3/3, gain flying, and become blue Illusions in addition to their other colors and types."
Gift of Tusks85%
$0.09↓#23827↓0.0610.7 years↑
"Until end of turn, target creature loses all abilities and becomes a green Elephant with base power and toughness 3/3."
Square Up85%
$0.07↓#27928↓0.005.5 years
"Target creature has base power and toughness 4/4 until end of turn."
Sea Kings' Blessing84%
$5.68↑#25549↓0.14↑32.4 years↑
"One or more target creatures become blue until end of turn."
Mordenkainen's Polymorph84%
$0.20↑#221820.12↑5.2 years
"Until end of turn, target creature becomes a Dragon with base power and toughness 4/4 and gains flying."
Zhalfirin Shapecraft81%
$0.15↑#14140↑0.003.5 years↓
"Target creature has base power and toughness 4/3 until end of turn."
Viridescent Wisps80%
$0.27↑#13370↑0.15↑18.5 years↑
"Target creature becomes green and gets +1/+0 until end of turn."
Polymorphist's Jest80%
$8.06↑#4643↑0.58↑12.3 years↑
"Until end of turn, each creature target player controls loses all abilities and becomes a blue Frog with base power and toughness 1/1."
Mind Transfer Protocol79%
$0.09↓#204650.27↑0.6 years↓
"Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/5."
Lizard, Connors's Curse79%
$0.35↑#10481↑0.67↑1.1 years↓
"When this card enters, up to one other target creature loses all abilities and becomes a green this card creature with base power and toughness 4/4."
Turn // Burn78%
$0.10↓#194740.0613.5 years↑
"Until end of turn, target creature loses all abilities and becomes a red Weird with base power and toughness 0/1."