For two mana, this white instant can either prevent all combat damage, regenerate target creature, or counter a spell that is targeting you
We know how many there are, and if we fill in the print run, we can get to percentages and odds
and one of the most interesting cards in the set, Merlin, Goat - three of them actually
For decks with three or more colors, where you might only be able to afford a small number of MDFCs since you'll need most of your lands to either be basics (for ramping / tutoring purposes) or tap for multiple colors of mana, the best MDFCs are Bala Ged Recovery (seriously, if you have green mana in your deck, play this card), Valakut Awakening, Hagra Mauling, and Ondu Inversion, along with the mythic cycle, which is almost always good if you can afford another land that only taps for a single color of mana
With 20% odds of the Traditional Foil being the Land card, you're likely to open approximately six packs with Traditional Foil Land cards
Eternal Witness is effectively the same thing, but lets you search your graveyard instead of your library
