Gem-Knight Amber (HA06-EN033) - Hidden Arsenal 6: Omega Xyz Unlimited

This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it become an Effect Monster with this effect.
Once per turn: You can send 1 "Gem-Knight" card from your hand to the Graveyard to target 1 of your banished monsters; add that target to your hand.