Outside of Niv decks, there are some Standard decks that come close to meeting Jegantha, the Wellspring restriction, but most have a small number of key cards that they probably can't afford to lose
I also tossed in the first one, great for stuff - and then the Boros colored seven-drop 5/5 flyer with first strike damage doubler on legs too
The reason it's important to keep the card separate is to make it clear that it is the card that was drawn this turn before revealing it to miracle it
+1: Target player mills two cards
Beyond the cast of cuddly critters lies an ancient secret, just waiting to be discovered
Alternatively, Ramp Commanders like Aesi, Tyrant of Gyre Strait and Hearthhull, the Worldseed can get Horn of Plenty out early, and draw lots of cards with it