At five generic and one of each colored mana it comes with a stack of abilities: hexproof, indestructible, lifelink, and trample
Right off the bat, I dont know how many clocks (if any) exist in MTG, but if we could build a deck revolving around clock artifacts and a bunch of creatures helping us build our clocks, that would be great
Necropotence is able to out pace Ancestral Recall for cards per mana or even initial cards influx however it is slower to draw the cards and typically slower to cast with somewhat restrictive colour requirements
While this may not seem useful, it has an ability that has it deal 1 damage to each opponent whenever you cast a non-creature spell, which we already know, we will be doing a lot of
Call the Gatewatch is great on turn three to ensure you have a planeswalker on turn four, but in the late game extra copies will let you tutor for your walker and play it in the same turn
At that point, it's too late for players to respond