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It can attack and block, even if another creature is carrying it

But cards like The Ozolith and Reyhan, Last of the Abzan are designed to hold onto the counters, preserving them until you play your next threat

Whenever one or more creatures you control deal combat damage to a player, you may reveal the top card of your library and put it into your hand

"Delve" means "For each generic mana in this spell's total cost, you may exile a card from your graveyard rather than pay that mana." The delve ability isn't an additional or alternative cost and applies only after the total cost of the spell with delve is determined