Growth Cards Rules (for my Renpy game) - Comments wanted!

Since I got the visuals to work like I wanted, now I need to nail down the cards I'll implement. I'm adapting my previous work, of course, but there's less creative leeway since it'll be coded into the game instead of described by yours truly in writing.

I'd love some comments and ideas to add. Anything's possible, technically, though some might be too annoying to code in.

My main consideration is to provide some different play styles (if the optimal strategy is just to hit 'Grow' over and over, what's the point of having options?). That's why I figure the main tension might be between wanting to build up growth multipliers with cards and to get to the higher tiers of size, which automatically gives a bonus. But happy to take suggestions.

Rules

Goal is to grow BIGGEST. Currently, no specific limit is decided upon (bigger is better, right?), but maybe 100,000 feet tall to win.

Main design consideration right now is how to provide different strategies. Idea is to provide cards that give you a long-term boost, but less immediate growth - and conversely, to encourage quick growth, to give access to stronger cards the larger you get, split into tiers.

First idea was for higher tier cards to provide x10 more size, but that might be too much. (But there needs to be a strong incentive to get up there first).

If this game becomes enough of a Thing to get art for, we could look into transformation effects for the characters as well depending on perks.

Main gameplay:

Draw 3 cards, pick 1 to play.

Tiers:

1 - 0-100 ft

2 - 100-1,000 ft - multiplier x5

3 - 1,000-10,000 ft - multiplier x25

4 - 10,000-100,000 ft - multiplier x125

Cards

Growth

Minor - Grow 2d5 ft

Medium - Grow 2d10 ft

Major - Grow 4d10 ft

Steal

Minor - Grow 1d5 ft

Medium - Grow 1d10 ft

Major - Grow 2d10 ft

Unfair (If this card gets drawn, you must play it)

Big get Bigger - the biggest player grows by 6d10

Unlucky - Grow the other player by 4d10

Gamble

Safe - 60% you grow 2d10, 40% the other player grows 2d10

Risky - 40% you grow 4d10, 60% the other player grows 2d10

High-roller - 20% you grow 8d10, 80% the other player grows 2d5

Sure bet - 90% you grow 2d5, 10% the other player grows 8d10

Redirect (is this too annoying to implement?)

Better on me - your opponent’s next card also applies to you, but twice as effective.

Perks

Choice - draw an extra card at the start of your turn (ie. choose 1 from 4 cards instead of 3).

Growth Multiplier - Add a stacking multiplier to your growth (depending on tier): 0.1, 0.2, 0.3, 0.4.

Steal Multiplier - Add a stacking multiplier to your size stealing (depending on tier): 0.1, 0.2, 0.3, 0.4

Gambler - Improve your odds by 10%/20%/30%/40%/ (Multiplicative).

Super

Double Turn - Immediately play two more cards.