Gatewatch Beacon

Planeswalkers arrive expensive and exposed, and a deck built to cast several of them rarely has the tempo to shield each one the turn it lands. This artifact answers that structural weakness while never stopping being a plain white mana source. The tap ability makes white every turn regardless of how many counters remain, so early it helps deploy the first walker ahead of curve. It also enters holding three loyalty counters at rest, passing one at a time to whichever planeswalker enters: a two-loyalty walker arrives at three, past the reach of a lone attacker or a single small ability. The two functions run in parallel rather than in competition, since moving a counter costs nothing but the counter itself and the mana keeps flowing throughout. What stops the boost from being a permanent free +1 is the reservoir's floor of three: once emptied, the artifact is a bare mana source with nothing left to move. Think three one-time boarding passes, not an ongoing engine. The trigger only fires as a walker enters, so a deck that keeps casting new planeswalkers gets more mileage than one propping up a single centerpiece. Niche by construction, built for a table full of walkers and largely inert without one.