yugioh starter structure decks And Deck Lot Yugi Volume 2 1 Structure Deck Yu-Gi-Oh Master of Pendulum Structure

[1] If this card is Special Summoned from the Extra Deck: You can add 1 Spell/Trap that mentions "Union monster" from your Deck to your hand

Note that there are no brakes here like once per turn or one class of spell like non-creatures

It's a great fit with its other version, Koma, Cosmos Serpent, giving you more things to do with Koma's Coils

As a bonus, you can sacrifice this samurai to make another creature indestructible for a turn

If it's an artifact, creature, or land card, you may put it onto the battlefield with a manifestation counter on it

It can be built as a lifegain commander, a Voltron commander, or even an angel typal commander