Digimon Emperor

[Start of Your Main Phase] For every 2 colors your opponent's Digimon and Tamers have, gain 1 memory. [On Play] Delete 1 of your opponent's play cost 5 or lower Digimon. Then, by returning 1 Digimon card from your opponent's trash to the bottom of the deck, from your hand or trash and without paying the cost, you may play 1 level 4 or lower Digimon card with the same color as the card this effect returned.

Inherited effect

Security Effect [Security] Play this card without paying the cost.