Arcbound OverseerHow it works & interactions with other cards

What It Does

Arcbound Overseer has two primary functions: a triggered ability and the Modular mechanic. The triggered ability fires at the start of your upkeep, placing a +1/+1 counter on every creature you control that possesses the Modular keyword. The Modular 6 ability means it enters the battlefield with six +1/+1 counters, and when it dies, you can transfer all of its +1/+1 counters to another target artifact creature.

Step-by-Step Resolution

First, when you cast Arcbound Overseer, it enters the battlefield with six counters already on it as a replacement effect. Second, at the beginning of your upkeep, its triggered ability goes on the stack; upon resolution, you count all creatures you control with Modular and place one counter on each. Third, if Arcbound Overseer dies, its Modular triggered ability triggers. You choose a target artifact creature you control, and as the ability resolves, you move all counters that were on the Overseer onto that target.

Common Mistakes

A frequent error is assuming Arcbound Overseer can put counters on any artifact creature during the upkeep. Note that the upkeep trigger only affects creatures that specifically have the 'Modular' keyword. Additionally, if the Overseer is destroyed by -1/-1 counters, it still passes its +1/+1 counters to a new target based on the number of counters it had immediately before leaving the battlefield, even if its toughness was reduced to zero.

When to Play It

Due to its high mana cost of eight, you should play Arcbound Overseer when you have established a board of smaller modular creatures or when you have ways to ramp into large artifacts. It is most effective when you can protect it for at least one upkeep cycle to maximize the free counters it provides to your entire team.

Interaction examples

Boosting the Construct Swarm

Myr Battlesphere

If you control Arcbound Overseer and cast Myr Battlesphere, the Overseer will not give counters to the Battlesphere or its Myr tokens during your upkeep because they do not have Modular. However, if Arcbound Overseer dies, you can use its Modular 6 ability to move all its +1/+1 counters onto the Myr Battlesphere, turning it into a massive 10/11 threat.

Recovering from Removal

Meteor Golem

If an opponent uses Meteor Golem to destroy your Arcbound Overseer, the Overseer's Modular ability triggers. You can target your own Meteor Golem (which is an artifact creature) to receive the six +1/+1 counters. This ensures that while you lost your engine, your remaining Golem becomes a significant 9/9 powerhouse.