The Iron Guardians (2021GB04-067)

[CNT] Put this into your field zone.
[Put this into the graveyard.] Choose 1 of the following:
Standard Action: Choose 1 or more cards named «Dai-Jinki, the Three Regalions Combined» in your graveyard or damage zone. Put them on the bottom of your deck.
Standard Action: [DR 4] Special summon 1 unit of level 2 or less with either "Masuraoh" or "Regalion" in its name from your deck. If the special summoned unit has any OD abilities, use them.
Instant Action: Until the end of turn, allied {Robotic} units ignore effect damage.
When an allied (Robotic) unit of level 2 or more enters play, [DR 2] to heal 1 life.