Combat Deck Feat Tree

[harmor]

In my campaign we don't, by default, use iCrit and iFumble iPhone apps for criticals and fumbles so we have this feat tree that unlocks these decks. Can you help me make this feat tree worth while to take?

Combat Deck (Combat)

Your crits and fumbles are more impressive.

Prerequisites: base attack bonus +1

When you crit you draw from the critical deck. When you fumble you draw from the fumble deck. When you roll to confirm a critical you add +1.

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Improved Combat Deck (Combat)

Enemies fumbles against you are to your advantage.

Prerequisites: Combat Deck, base attack bonus +6

Benefit: Creatures that attack you and fumble pull from the fumble deck. When you roll to confirm a critical you add +2.

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Greater Combat Deck (Combat)

Your mastery of critical and fumbles is complete.

Prerequisites: Improved Combat Deck, base attack bonus +11

Benefit: You draw two cards and choose the better card. When you roll to confirm a critical you add +4.

[Tim4488]

I'd say if they have to spend a feat, let them do a minimum of double damage even if the crit card says only normal damage.

[harmor]

What if they auto-crit confirm for the Greater feat?