Rarity can often be identified through symbols, set markings, and limited distribution methods
Normally, only the active player declares attackers, but Party Crasher doesn't play by those rules
4 Eternal Witness Eternal Witness, and its older sibling, Timeless Witness, can return any card from your graveyard to your hand
Whenever Barrowin attacks, return up to one creature card with mana value 3 or less from your graveyard to the battlefield if you've completed a dungeon
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A prominent example is the "Voltron" strategy, when the deck casts its commander and loads it up with powerful equipment and aura cards to create an unstoppable attacker