Great Cannon Dragon, Heavy Arzene

/:Engorge (When this unit attacks, you may retire one or more of your other rear-guards. If you do, it is engorged until end of turn) : 1 When this engorged unit is retired from for the effect or cost of your vanguard with the engorge ability, you may pay the cost. If you do, look at four cards from the top of your deck, call up to two grade 2 or less cards from among them to separate , and put the rest on the bottom of your deck in any order.