Cresgarurumon - play in black
The [BT3-073] Cresgarurumon is a super rare rarity card that introduced in BT3 Union Impact. Currently It is not very popular in the winning tournament deck (that I observed from our site collection). This digimon has reboot, and "When digivolved" for each of opponent's digimon, you can reveal 1 card from top of the deck, play 1 LV5 or less digimon without cost. To utilize the main benefit of this digimon's "when digivolved", the deck should put more LV5 digimon card.
Level 5 Digimons
The most valuable LV5 for Cresgarurumon is [P-015] Infermon, "when played" 1 of opponent's digimon <De-digivolve 1>. But since it is a promo card, it is not easy to buy or not cheap to buy. The other LV5 common card, [BT2-061] Andromon– a blocker, needs to put 4 cards of this digimon to the deck since black needs blocker anyway. And the Cresgarurumon is a "reboot"digimon, the LV5 [BT2-063] Metalgreymon is a good companion because if this digmon has "reboot" then <Security Attack+1>. The last LV5 candidate is red [BT1-023] Skullgreymon, "when played" destroy 1 of opponent's digimon with blocker.
There is only 2 black Tamer available for now, [BT3-095] Joe Kido (2 costs) – if you have a digimon with blocker, get +1 memory (needless to say the reason why we need it, black deck always has many blockers). The other is [BT2-089] Tai Kamiya, secures 3 memories for beginning of your turn and all black digimon get +1000DP in opponent turn. Tai Kamiya is very useful to use in this deck for its +1000DP to black digimon in opponent turn. The Cresgarurumon only has 11000DP, I will not intend to digivolve Cresgarurumon to LV7 digimon if it has many inheritable effects for "reboot" from evolution-base source without LV3 [BT2-055] Toyagumon included.
To destroy Cresgarurumon, opponent digimon need to be a LV6 (at least) or LV7. The special/rare LV6 with some powerful effects will normally has 11000DP, the cheap common LV6 has 12000DP but not widely use after BT3 came. So with the support from Tai Kamiya, Cresgaruru has 12000DP in opponent turn. Of course we don't want to mention about the expensive way to destroy it such as Gaia Force, Ice Wolf Claw (return to hand), Giga Cannon (De-digivolve 4) or Trump Sword. If Cresgarurumon play against green, they may use [BT1-110] Flower Cannon (2 costs) to rest this digimon and attack it, so if we make Cresgarurumon 12000DP, then they might need to reconsider to attact it.
There is one deck that introuduced by digimon_tcg on twitter, which is very good to play Cresgarurumon. You can try out with your black digimon. In my opinion, I would like to use [BT2-057] Greymon instead of [BT3-067] Tankmon.
Tamer Battle: Cresgarurumon Vs Green BanchoStingmon