(2021-07-23) Gaining a level won't remove abilities that a Class had at a previous level
The Pack Points System & Which Cards To Pick Once you get past the tutorial and have gotten at least one level of experience, you will be introduced to the Pack Points system

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At its worst, it's still a 6 mana costed card with 7/6, Trample and Haste, so it's still a strong card without its ability
It gets wild with Karn, the Great Creatorits not infinite turns, but its enough that its hard to imagine not winning from there
Does your deck care about +1/+1 counters