Ace (OP16-118) actually runs cheaper on the standard SEC print, around $12-13 on TCGPlayer, but his alternate art version flips the order, trading around $62, the highest single print among the two SEC Character cards
With around 48 mono-blue cards that let you surveil and 153 that let you scry, theres no shortage of synergy to explore when building around Matoya
Part of the reason Im being a stickler about this distinction is that there are actual MTG rules about what it means to move a counter, and some niche interactions pop up when you compare moving counters to removing a counter from one thing and putting a counter elsewhere. I can also see a future where we get rules text that references whenever you move one or more counters, which would require precise text on the card
Sacrifice after III.) I The Ring tempts you, then each player mills cards equal to your Ring-bearer's power
Sure, you need to be able to generate all five colors of mana to make the most of it, but that shouldnt be too much of a problem given Explorers excellent mana base