Gundramon (BT6-065) - Double Diamond Foil

[Blocker] (When an opponent's Digimon attacks, you may suspend this Digimon to force the opponent to attack it instead.)
[When Digivolving] Reveal the top 5 cards of your deck. You may use 1 Option card with a memory cost of 7 among them without paying its memory cost. Trash the remaining cards. If you don't use an Option card with this effect, delete 1 of your opponent's Digimon with a play cost of 4 or less.