Lumengrid Sentinel

Creature — Human Wizard

Produces: a permanent becoming tapped.

Cares about: an artifact entering the battlefield.

Partners

45 cards can cause a permanent becoming tapped.

1. Freyalise's Winds — When Lumengrid Sentinel becomes tapped, Freyalise's Winds puts a counter on a permanent

1,038 cards can cause a Wizard it boosts.

1. Docent of Perfection // Final Iteration — Docent of Perfection // Final Iteration gives Lumengrid Sentinel bigger stats
2. Naru Meha, Master Wizard — Naru Meha, Master Wizard gives Lumengrid Sentinel bigger stats

1,090 cards can cause an artifact entering the battlefield.

1. Leonardo da Vinci — When a Thopter enters thanks to Leonardo da Vinci, Lumengrid Sentinel triggers
2. Urza's Command — When a Powerstone enters thanks to Urza's Command, Lumengrid Sentinel triggers
3. Spawning Pit — When a Spawn enters thanks to Spawning Pit, Lumengrid Sentinel triggers
4. Basalt Golem — When a Wall enters thanks to Basalt Golem, Lumengrid Sentinel triggers
5. Sai, Master Thopterist — When a Thopter enters thanks to Sai, Master Thopterist, Lumengrid Sentinel triggers
6. Threefold Thunderhulk — When a Gnome enters thanks to Threefold Thunderhulk, Lumengrid Sentinel triggers
7. Castle Doom — When a Robot enters thanks to Castle Doom, Lumengrid Sentinel triggers
8. Simulacrum Synthesizer — When a Construct enters thanks to Simulacrum Synthesizer, Lumengrid Sentinel triggers

244 other cards cause it too, equally specific. The ones shown are the best connected.