Ludomon

Effect

[On Play] By placing this Digimon under 1 of your other Digimon that's red or has the [Legend-Arms] trait as its bottom digivolution card, you may reveal the top card of your deck. If that card is a Digimon card with the [Legend-Arms] trait and a play cost of 7 or less, you may play it without paying its memory cost. Add the rest to your hand.

Source Effect

[Opponent's Turn] While you have a Digimon that's red or has the [Legend-Arms] trait in play, this Digimon gains ＜Blocker＞ (This Digimon can block in the blocker timing.).