here's my suggestions for 2 more packmaster packs.

(Defiant defenders) a pack themed around base game cards that provide block. pack hat is the block symbol over your head.
contains the following cards: iron wave, armaments, dash, backflip, hologram, wallop, sanctity, talk to the hand, glacier, after image.

(xtreme gambits) a pack themed around using and empowering X cost cards, chemical x obtained seperately. pack hat is the relic chemical x as a helmet over your head.
contains the following base game cards: whirlwind, skewer, reinforced body.
contains the following modded cards.
(chemical S) 1 cost common skill: your next X cost card has +2(+3) added to the value of X.
(chemical T) 0 cost common skill: choose a X cost card in your draw or discard pile to add to your hand. (this card gains retain when upgraded).
(chemical U) 1 cost common skill: gain 4(6) block, the next X cost card played has +1 added to the value of X.
(chemical V) 1 cost common attack: deal 5(8) damage, the next X cost card played has +1 added to the value of X.
(chemical W) X cost uncommon power: gain 3(6)X omega and block.
(chemical Y) 1 cost rare power: X cost cards are played twice.(this card gains innate when upgraded)
(chemical Z) X cost rare power: X cost cards with different names from chemical Z have X+1(X+2) added to the value of X.