Karn's Bastion ties it all together by giving you steady proliferation over time, so your Sarkhan turns keep getting stronger
Now, Energy Exchanger is still in the format, but generally isnt used because the decks that need a ton of energy, Reshiram variants and MagneBoar run a very effective drawing Pokmon, coupled with a fair amount of either hand refresh cards or digging cards
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You can see an overview here: 90% (4th card), 60% (5th card) 5% (4th card), 20% (5th card) 1.666% (4th card), 6.664% (5th card) 2.572% (4th card), 10.288% (5th card) 0.5% (4th card), 2% (5th card) 0.222% (4th card), 0.888% (5th card) 0.04% (4th card), 0.16% (5th card) So, if you open 1,000 boosters, there should be one to two cards of the crown rarity
Frequently Asked Questions How much is AWOL worth