I'm not sure why there isn't a check, but ex01 garuru lets you play a 3 cost or less matt ishida from hand without paying the cost. I play bt15 matt using the effect. Once matt hits the field, bt15 gabu's when attacking to draw 1 is triggered. This lets you activate bt15 matt's effect to suspend him to gain 1 memory when a digimon effect adds cards to your hand. I'm pretty sure it takes a while because I was checking with jorel that everything was triggering properly. Then I think I forgot that I had even attacked. lol
I should not have put a card back in game 1 off weregaru x, that only triggers if you have x antibody or were underneath. You have to have were or x antibody to add a card back. I only run one in the deck and have been testing it out, but I'm not a huge fan because of the memory cost and the discard cost to unsuspend.