Shellmon BT22-021 C

[Decode "Lv.3 w/[Aqua]/[Sea Animal] in any trait"] (When this Digimon would leave the battle area other than in battle, you may play 1 level 3 Digimon card with [Aqua] or [Sea Animal] in any of its traits from this Digimon's digivolution cards without paying the cost.)
[On Play] [When Digivolving] You may place 1 level 5 or lower Digimon card with [Aqua] or [Sea Animal] in any of its traits from your hand as any of your Digimon's bottom digivolution card.
[Rule] Trait: Has [Aquatic] Type. Digimon