Captain Rex Nebula + Aetherflux Reservoir + Basilisk Collar

Captain Rex Nebula

Aetherflux Reservoir

Basilisk Collar

How it works

1. At the beginning of your combat phase, Captain Rex Nebula triggers, causing Aetherflux Reservoir to become a Vehicle artifact with crew 2.
2. Activate Aetherflux Reservoir's crew ability by tapping Captain Rex Nebula, causing Aetherflux Reservoir to become an artifact creature until end of turn.
3. Give Aetherflux Reservoir lifelink.
4. Activate Aetherflux Reservoir by paying 50 life, dealing 50 damage to any target and causing you to gain 50 life.
5. Aetherflux Reservoir triggers.
6. Holding priority, repeat from step 4.