(You may cast a card for its miracle cost when you draw it if it's the first card you drew this turn.) It's important to reveal a card with miracle before it is mixed with the other cards in your hand
This is why I mention Legacy as its such a game-action-rich format that Discovery should cost one to two mana most of the time there
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Look into ways you can make those one or two treasure / clue / food tokens as you just otherwise play normally
For example, Nibelheim Aflame seems like a potent addition to Zurgo, Helmsmasher decks
If were allowed to get out of hand, theres also the opportunity to get the Springheart Nantuko on any of these (oh, if its the Baloths!) to make token copies of them with every land, turning a modest 5-land entry on a turn from 5 4/4 beasts to 5 copies of Frenzied Baloths, plus 1 + 2 + 3 + 4 + 5 beasts, for a total of 15 4/4 beasts suddenly appearing on the field