You still cast the cards as face-down 2/2 creatures for 3 mana, and you can turn them face-up for their megamorph costs as a special action
Also when you are concerned about early tempo you are also likely going to be concerned about life and so not having the painless cast option does detract from the appeal of the card
At the start of each turn, if there is no revealed bounty card, the next one is revealed, and if the bounty deck runs out of cards, shuffle them again and start over
I suppose you could toss in Memnarch or some other infinite mana outlets and turn your Tazri into a high-powered deck
It can attack the turn you drop it and give you back mana
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