Whenever one or more creatures attack one of your opponents, if any of those creatures have power or toughness equal to the chosen number, Squall deals damage equal to its power to defending player
A lot of cards will mill you on entry, like Carrion GrubCarrion Grub, Deadbridge ChantDeadbridge Chant, Moldgraf MillipedeMoldgraf Millipede, and Stitchers SupplierStitchers Supplier
This is a Link-2 Monster that requires 2 Level 3 Monsters, and whose effect is that it can dump a Level 3 Monster from your Deck to the GY
You need a bit of a board presence to really make use of this Ooze, but even with five or six creatures out it can quickly put the pressure on your opponents

Set Price Guide Evolutions Ranked by market price (highest value first) Ultra M Charizard EX #101 $125.12 Rare Charizard #11 $88.72 Ultra M Blastoise EX #102 $58.75 Ultra M Charizard EX #13 $52.10 Ultra Dragonite EX #106 $39.80 Ultra M Venusaur EX #100 $36.04 Ultra Mewtwo EX #103 $36.04 Ultra Misty's Determination #108 $29.48 Rare Mew #53 $29.38 Ultra M Blastoise EX #22 $18.39 Ultra Charizard EX #12 $16.35 Ultra M Pidgeot EX #105 $13.41 Ultra M Venusaur EX #2 $12.84 Secret Surfing Pikachu #111 $8.51 Ultra Pidgeot EX #104 $8.31 Ultra M Slowbro EX #27 $7.88 Ultra Mewtwo EX #52 $7.68 Secret Flying Pikachu #110 $7.39 Ultra Brock's Grit #107 $7.26 Ultra Dragonite EX #72 $7.05 Rare Gyarados #34 $7.03 Rare Raichu #36 $6.32 Ultra Blastoise EX #21 $5.99 Rare Ninetales #15 $5.18 Ultra Venusaur EX #1 $4.96 Ultra M Pidgeot EX #65 $4.47 Rare Zapdos #42 $4.45 Rare Nidoking #45 $4.20 Rare Machamp #59 $4.08 Ultra Ninetales BREAK #16 $3.89 Ultra Nidoking BREAK #46 $3.04 Ultra Machamp BREAK #60 $2.97 Rare Mewtwo #51 $2.60 Ultra Slowbro EX #26 $2.50 Rare Poliwrath #25 $2.45 Rare Clefairy #63 $2.33 Secret Imakuni?'s Doduo #112 $2.27 Rare Chansey #70 $2.19 Ultra Starmie BREAK #32 $2.14 Rare Magneton #38 $1.99 Secret [Exeggutor] #109 $1.98 Ultra Pidgeot EX #64 $1.80 Darkness Energy #97 $1.75 Rare Hitmonchan #62 $1.70 Secret Here Comes Team Rocket

Ive only ever heard second hand information about the origins of these boxes however, and as you can imagine not a lot of information is out there