ST20 Agumon & ST21 Gabumon let the deck abuse EX4 Matt Ishida & Tai Kamiya to ping-pong like Alter S but skipping the lv5.
BT17 Secret Greymon is still an Amazing card even though it can't Digivolve over ST21 Gabumon and BT17 SkullGreymon helps with some additional board control as well as letting you proq BT17 Greymon's On Deletion ESS.
