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Those Monsters are referred to as Link Materials , and are listed on the first line of each card's Lore

QCSE Quarter Century Secret Rare Limited Limited Right Leg of the Forbidden One X DARK Level 1 [ SpellcasterNormal ] ATK 200 DEF 300 A forbidden right leg sealed by magic

If a creature you don't own has a coin counter on it, that permanent will return to the battlefield under your control when it dies or is exiled while you control Athreos

Finally, Imperious Perfect may have a more modest impact, but that consistency in churning out 1/1s (that then get pumped) will be important if you ever run low on cards in your hand