It can either swing as a 3/2 or grant another creature a +1/+1 buff for the turn, which is always nice
A lot of the cards reference the names of cards, requiring you speak it aloud (like Emcee) or checking the name for a quality of some kind (like Double Header or Wordmail)
The devil with this small piece is in the details, small things like the knights in formation in the back, the standards, and the fact the 'leader' is the only knight in a red tunic all sell this piece effectively
On a more general note, a mis-timed critical hit accidentally knocking out the opponent's/your Pokmon can ruin the whole progress too
BT13-083 C Digimon Lv.4 Gizmon: AT Color Purple Cost 6 DP 6000 Form Champion Attribute Unknown Type Unknown Card Text 1 [Effect] When you would play this card, by deleting 1 of your level 3 Digimon, reduce the play cost by 4