Regardless of the mechanic, we have some strong +1/+1 counter synergies, so you might want to take a look at these and add some to your counter/proliferate decks
While this is all fairly straightforward, card rarity in MTG does have some quirks
Clean, centered holos go directly into protective sleeves
If you attach 1 Don to him, you can activate your Leader's effect to set 2 Don as Active
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It's easier to destroy too, of course, but if you manage to cheat Ancient into play then it doesn't even matter if it's killed since, at worst, you can immediately tap all your permanents for mana in response and use it as a ritual to power out your degenerate spells