Treasure Map goes far too late in the Arena Cubes, and is a card that I would play in most of my non-aggressive Vintage Cube decks
Every time you do, Mirko gets a +1/+1 counter, constantly letting you increase their power turn after turn
Card advantage in black that asks you to pay some life doesnt get any more classic, foundational Magic than this 2-power creature
I wouldn't jam it in a hodge-podge mixed Voltron deck because of that high cost though - but in my opinion that's what makes a well designed card for an archetype
This also happens if Macie becomes untapped some other way at some other time or if Macie leaves the battlefield
It only counters instants and sorceries, so its more niche, but if youre weak to a boardwipe in your strategy, then this is the main spell type youre worried about anyways