Raging Battle Mouse 
Creature — Mouse
$0.22 #12427 0.00 3.1 years
The second spell you cast each turn costs less to cast.
less to cast.Celebration — At the beginning of combat on your turn, if two or more nonland permanents entered the battlefield under your control this turn, target creature you control gets +1/+1 until end of turn.
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Uthros Psionicist100%
$0.22#9584↑0.22↑1.2 years↓
"The second spell you cast each turn costs 
less to cast."
less to cast."
Highspire Bell-Ringer100%
$0.16↓#109430.001.5 years↓
"The second spell you cast each turn costs less to cast."
less to cast."
Alisaie Leveilleur92%
$0.25↑#3512↑0.31↑1.4 years↓
"The second spell you cast each turn costs less to cast."
less to cast."
Monk Class84%
$0.37↑#9917↑0.065.2 years↑
"The second spell you cast each turn costs less to cast."
less to cast."
Stone Calendar84%
$14.91↑#20542↓0.37↑32.2 years↑
"Spells you cast cost less to cast."
less to cast."
Memory Crystal78%
$2.23↑#24089↓0.19↑28.3 years↑
"Buyback costs cost less."
less."
Helm of Awakening77%
$1.61↑#1927↑0.32↑29.7 years↑
"Spells cost less to cast."
less to cast."
Naiad of Hidden Coves76%
$0.22#106180.066.7 years↑
"During turns other than yours, spells you cast cost less to cast."
less to cast."
Geyser Drake76%
$0.13↓#8697↑0.19↑2.5 years
"During turns other than yours, spells you cast cost less to cast."
less to cast."
Hardened Berserker76%
$0.04↓#24352↓0.0011.6 years↑
"Whenever this creature attacks, the next spell you cast this turn costs less to cast."
less to cast."
Pearl Medallion74%
$7.43↑#429↑0.19↑29.0 years↑
"White spells you cast cost less to cast."
less to cast."
Sapphire Medallion74%
$7.87↑#354↑0.34↑29.0 years↑
"Blue spells you cast cost less to cast."
less to cast."
Ruby Medallion74%
$14.07↑#293↑0.28↑29.0 years↑
"Red spells you cast cost less to cast."
less to cast."
Vine Gecko73%
$0.19↓#20023↓0.25↑6.1 years↑
"The first kicked spell you cast each turn costs less to cast."
less to cast."
Herald of Kozilek72%
$0.36↑#6409↑0.29↑11.0 years↑
"Colorless spells you cast cost less to cast."
less to cast."
Emerald Medallion72%
$5.16↑#582↑0.30↑29.0 years↑
"Green spells you cast cost less to cast."
less to cast."
Jet Medallion72%
$13.42↑#274↑0.27↑29.0 years↑
"Black spells you cast cost less to cast."
less to cast."
Urza's Filter71%
$4.88↑#146640.30↑26.0 years↑
"Multicolored spells cost less to cast."
less to cast."
Spellwild Ouphe71%
$0.29↑#16690↓0.0919.5 years↑
"Spells that target this creature cost less to cast."
less to cast."