First of all, it's free to everyone, and even the "premium" half is only bought via purely earned in-game currency, and only for the price of a handful of boosters
In fact they weigh about 1.3 grams each compared to about 1.7 grams each for the real cards
Preventing your opponent from summoning monsters will always be beneficial in Yu-Gi-Oh!, especially in the era of archetypes that can endlessly summon each other to field their most powerful unit in one turn
(6000 3 = 18000 damage) 1700 + 1500 + 1600 + 2600 + 1700 + 3000 + 2600 + 1700 + 3000 + (6000 3) = 37400 damage [Going Second] Combo 2: Tenpai Dragon Paidra + 1 Card Normal Summon Tenpai Dragon Paidra
Additionally, unspent mana becomes Red, instead, and Ozai gains both flying and indestructible if you have six or more unspent mana
Duel Links 2019-07-11 Oh F!sh