Corridor Monitor + Legion Loyalty + Strionic Resonator + Thran Dynamo

Corridor Monitor

Legion Loyalty

Strionic Resonator

Thran Dynamo

How it works

1. Declare Corridor Monitor as an attacker, triggering its myriad ability.
2. Holding priority, activate Thran Dynamo by tapping it, adding CCC.
3. Activate Strionic Resonator by paying 2 and tapping it, copying Corridor Monitor's myriad trigger.
4. Resolve the copy of Corridor Monitor's myriad trigger, creating a token copy of Corridor Monitor that is tapped and attacking each other opponent.
5. The Corridor Monitor tokens enter the battlefield, untapping Thran Dynamo and Strionic Resonator.
6. Repeat from step 2.