Its a simple ruleset which basically limits the available cards only to even-numbered cards. At first this might seemed a simple ruleset where the one to have more cards with even numbers should gain advantage from any accompanying ruleset that might come.

Peakd : @kid.miniatures/battle-mage-secrets--even-stevens-ruleset
Twitter :

Battle Challenge : BATTLE MAGE SECRETS : EVEN STEVENS RULESET#LEOFINANCE#SPLINTERLANDS#PLAY2EARN#SPLINTERTALK#ONEUP#BDVOTER#NEOXIAN#STEEMMONSTERS#BATTLE#MAGEhttps://t.co/jDPFpl5oSE

— Kid Miniatures (@kid_miniatures) May 27, 2023