Saheeli Rai + Liquimetal Coating + Mirror Box

Saheeli Rai

Liquimetal Coating

Mirror Box

How it works

1. Activate Liquimetal Coating by tapping it, causing Saheeli Rai to become an artifact until end of turn.
2. Activate Saheeli Rai's second loyalty ability by removing two loyalty counters from it, creating a token copy of itself that is an artifact in addition to its other types.
3. Repeat step 2.

This clever loop starts by using Liquimetal Coating to turn Saheeli Rai into an artifact, paving the way for her −2 loyalty ability to target herself. Thanks to Mirror Box removing the legendary rule, you can safely create a token copy of her without losing the original. That freshly made token copy is also an artifact, meaning it can immediately use its own −2 ability to copy another Saheeli Rai, letting you chain these activations indefinitely to flood the board with infinite planeswalker copies.