It was a perfect fit, and Squee made the cut in many deck, such as the Standard Recurring Nightmare + Survival of the Fittest decks where you'd go for him first with the Survival so you could recur him again later on and would continue ad nauseum
Which would be fine, except they killed his lion, too
Promo Info BOOSTER ACROSS TIME [BT-12] CLOSECLOSE BT12-064 C Digimon Lv.4 Tuwarmon Color Black Form Champion Attribute Virus Type Mutant/Xros Heart DP 6000 Cost 5 Digivolve Cost 1 3 from Lv.3 Digivolve Cost 2 1 from Lv.3 Upper Text Digivolve: 3 from Lv.3 w/Save in text [When Digivolving] De-Digivolve 1 1 of your opponent's level 5 or lower Digimon
When this card is Normal Summoned: You can add 1 card that mentions "Black-Winged Dragon" from your Deck to your hand, except "Blackwing - Sudri the Phantom Glimmer"
The unique distribution model tied Generations exclusively to Mythical Collection boxes each month from February through December 2016, a new Collection Box featuring a different Mythical Pokemon (Mew, Celebi, Jirachi, Manaphy, Darkrai, Shaymin, Arceus, Victini, Keldeo, Genesect, Meloetta) was released containing 2 Generations packs, a figure, and a promo card
This is also why the number of secret rares far outnumber the cards in the main set