Silent Arbiter [Commander Masters] Pauper you must place all cores

you must place all cores from one of your spirits that costs 4 or more into your reserve

[AUTO] [CXCOMBO] [(1)] At the beginning of your attack phase

Rinmeikan Girls School Power: 5000 [AUTO] [CXCOMBO] When this card's battle opponent becomes [REVERSE]

Whenever one or more players sactificer one or more creatures

Each Sword & Shield: Brilliant Stars - 3-Pack Blister (Leafeon) includes:

Silent Arbiter [Commander Masters] Pauper you must place all coresSet: Commander Masters Type: Artifact Creature Construct Rarity: Rare Cost: {4} No more than one creature can attack each combat. No more than one creature can block each combat. Scholars say that arbiters exist on every world, created by an unknown hand to enforce justice.