The Last Guardian BT20-100

Effect: [Main] Reveal the top 3 cards of your deck. Add 1 [Cool Boy] and 1 card with the [Royal Knight]/[X Antibody] trait among them to the hand. Return the rest to the bottom of the deck. Then, place this card in the battle area._x000D_
[All Turns] When any of your Digimon with [Omnimon] in its name would leave the battle area, ＜Delay＞ (After this card is placed, by trashing it the next turn or later, activate the effect below)_x000D_
・1 of those Digimon doesn’t leave.

Inherited Effect: Security Effect [Security] You may play 1 [Omekamon]/[Cool Boy] from your hand or trash without paying the cost. Then, place this card in the battle area.