Most of the heavy hitters start at five mana and go up from there, which means your deck construction has to account for that

Here are the first-time rewards for each difficulty level: Beginner : Pack Hourglass x2, Promo Pack, Shop Ticket Intermediate : Pack Hourglass x4, Promo Pack, Shop Ticket Advanced : Pack Hourglass x6, Promo Pack, Shop Ticket Expert : Pack Hourglass x8, Promo Pack, Shop Ticket And here are the Chance Rewards for each difficulty level, along with their likelihood of being rewarded after each match: Beginner : Promo Pack (51%), Shinedust x25 (100%), Shop Ticket (38.7%) Intermediate : Promo Pack (64%), Shinedust x25 (100%), Shop Ticket (48.3%) Advanced : Promo Pack (80%), Shinedust x25 (100%), Shop Ticket (60.4%) Expert : Promo Pack (100%), Shinedust x25 (100%), Shop Ticket (75.5%) Pokmon TCG Pocket Ultra Beast Drop Event: All Promo Cards Players who earn Promo Packs during the Ultra Beast Drop Event will have those cards added to the gifts menu on the home page of the app, where they can be opened one at a time to receive one card out of a pool of five

What you need are cards like Wall of Omens, little Jace, Snapcaster, Stoneforge Mystic, Mother of Runes, Dragonmaster Outcast and Selfless Spirit
It's actually sort of a double debut for Floette via the Mega Floette card, as not only is it the first time its Mega Evolution has ever been included in the TCG, but it also marks the introduction of Eternal Flower Floette to the TCG
Cryptic Command - The Essence of Modal Spells Courtesy of: With its four interchangeable modes wrapped into one card, Cryptic Command exemplifies flexible modal spells