AUTO (Vanguard circle): Generation break 2: (If you have 2 or more face-up G Units in your vanguard circle or generation zone) When this unit attacks a vanguard, choose one of your rearguards, during this turn it gets Power +4000, and during the end phase of that turn, draw one card and retire that unit.
AUTO (Vanguard circle): [Counterblast 1] During your turn, when you stride with a G Unit, you may pay the cost. If you do, choose up to two of your rearguards, during this turn they get Power +4000 and "AUTO (Rearguard circle): When an attack by a unit in the same column as this unit hits a vanguard, if the attacking unit's Power is 20000 or greater, draw a card."
Big Belly's on-stride counterblast is how he'll be used for most of the game. Because this skill does not retire your rearguards, it both creates the possibility for a flat increase in card advantage and makes it more likely to happen by strengthening your rearguard lanes. Furthermore, Belly can always target his own booster for the skill assuming that you set it in play on the turn beforehand, which means that you can get a +1 off of your stride regardless of its other abilities since the vanguard's power will automatically exceed 20000. Belly's unique property is thus that the more successful your aggression, the better a defensive position you are put in. Each attack that connects grants you another card in hand, prepping you for the opponent's counterattack.
Big Belly's generation break 2 comes into play in turns where Phoenicialux is undesirable or no longer available. This is more in line with Chatnoir proper, giving +4000 power to a rearguard when he attacks, drawing a card in the end phase and then retiring the powered-up unit. Like in the Phoenicialux combo example, using rearguards that replace themselves or ones that cannot be retired by card effects causes Big Belly's draw skill to become a +1 in advantage rather than a neutral exchange. Compared to Chrono Jet Dragon blocking the opponent's perfect defense cards or Flower Maiden of Ranunculus field power bonus, Big Belly is not as dramatic a skill as one may anticipate from past generation breaks. His strengths lie in being able to consistently weather long games and enjoy considerable freedom versus field control decks.