9 pocket card sleeves 100-pack Armour Regular Card (100 pack) For sealed box orders (100 count) Trading Card Sleeves 100 Pack

Each Player can only control up to 5 Monsters and 5 Spells/Traps (including Pendulum Monsters activated as Spell Cards but excluding Field Spell Cards) at any time

The competitive deck that has abused the mechanic the most for years is "Zoodiac," who were the strongest deck in the game at one point and are now splashed into the "Tri-Brigade" deck to summon the most powerful Xyz monster in the metagame: "Divine Arsenal AA-Zeus - Sky Thunder." Synchro After Duel Monsters and GX went by, a new summoning mechanic was finally released with 5DS

Others will not use it

A free, desktop tool called Arena Tutor tracks your Arena collection, let you know if you've got 100% of a set, and gives you a nice perspective on what you're missing