Creature stacking game

I know I had another idea I was working on in a previous post but the mechanic didn't really fit in the theme I was going for, the theme is aliens or creatures so here is what I have so far

This game can be played by more than 2 people max 99 people

So each player has a deck of 30 cards, this game can be played with just 1 deck of cards shared between each player but I wanted to have a deck-building element and collecting and trading other cards

so everyone draws 7 cards and the first player will play a card in the middle of the table. each creature cards has a combat power percentage, and the idea is you have to play a card on top of another card that has a combat power percent higher than the card that was played before your turn

so if player 1 plays a card with a combat power of 15%, on my turn I play a card with a combat power of 20%, I cannot play a card with a power lower than the one that is currently on the table.

to make deck building fair and to prevent people from just building cards with high combat power, each card is divided into stages or tiers

so the lava stage cards have a combat power between 1%-10 then the next stage has more power and so on and so forth, when constructing a deck you must have 10 lava creatures 10 of the next tier, 8 of the next tier and 3 of the last tier.

I haven't figured out if I should have special creatures with no power or not, the special creatures have special abilities that affect let's say the next player or something.

also, I have come up with a win condition yet, though I was thinking of if you use all your cards in your hand you win but what if you have more lava stage cards in your hand than any other card so once the center pile combat power reaches above 10% you are stuck with low power cards

So I don't know if there should be multiple piles going at once or there will be a max limit of cards on the pile before it is refreshed with a new pile, so if the pile reaches 10 cards then it resets

that is what i have so far