[Confred]

Pondering Phylarcy Familiar after its removal lead to three cards up for testing:

Mechanical Drudge

The Familiar could tie into the set by having something that lasts once it receives its +1/+1 counters. This Mechanical Drudge adds a price to what is essentially regeneration and drops the extras.

Spoiler Alert!

Arcbound Phylarcy

This variant removes the complete invulnerability, but mainly gets rid of the counter confusion. A set shouldn't really have more than one counter to put on its specific permanents. Having both +1's and charges were bound to cause confusion. This variant utilizes the +1's as charges. Costs 2 to avoid Warbound and to differentiate itself from Worm Stone.
Testing will check competition against Dende's Ring. The results should be different enough and the redundancy of mana producers a good thing.

Arcbound Channeler

Continuing from the thoughts of Arcbound Phylarcy being too close to Dende's Ring, I combined it with another card that was on the fence. It tapped for 1 mana to anybody and burned them if they didn't spent it.

Spoiler Alert!

Endless Soldier

Also considered a 1/3 for 3, but was tired of too many things costing 3 and not enough that cost 1. This is a reconfigured Mechanical Drudge put up there for testing.There is an unfortunate lack of 1cc creatures and the higher activation cost could properly slow things down. Also testing at common.