Red shouldn't have more efficient creatures than green

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Green's entire shtick is having undercosted creatures. But let's compare green's Leaf Gilder to red's Subterranean Scout. The green one costs 1 more. Why?
(yes I know this is stupid)

Unknown

In the paper game actually the red one costs exactly the same but makes one creature unblockable, green doesn't have all the best creatures, it shares it with white and red afaik. Green has under costed fatties like the colossus.

Unknown

And the green one gives you mana.

Unknown

Yes, when tapping but activated abilities haven't been really well transferred to puzzle quest. I was more talking about cost and triggered abilities when comes into play