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Another is that it is an Artifact Creature that allows to work well in Delirium decks by hitting two different card types as well

[78] Riceball promos[] Three alternate art Orb of Dragonkind versions, featuring "Onigiri"-style characters by illustrator Kawasumi were released as Buy-a-Box promos in Japan only for the release of Dungeons & Dragons: Adventures in the Forgotten Realms

But then you can activate it for four mana to proliferate, so after your opponents' defenses have been set up and you cannot attack further you can do that a few times to finish them off

And you may have Hardened Scales on the board