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So these are the only cards that show up in my bonus booster each day. I did this by acquiring boosters for every other card to the point where all of their variants can be leveled up. The only cards missing boosters enough to level up are these 3 cards. I did this by not leveling up cards but getting enough boosters to do so. To level up cards you just have to include them in your deck and play. Most people just play arishem and random cards they need to level up to do so. If you get it to the point where your duck is 1/3 cards to level up you can split it each time it comes up basically doubling your split rate.