The Rattleclaw Mystic will flip up for two to make three and then tap for those colors too on a mana dork two flip and drop 2/1 body
Pick however many cards youd like to swap, place them on the bottom of the deck, and then draw new cards in equal number from the top
To be sure, Nirkana Revenant will all but ensure that it will keep itself safe by doubling up on all your mana needs and giving you an outlet for all that extra mana
It is more the case of whether the card disadvantage is worth the effect when you are not screwed or flooded, which the depth of filtering with a nice range of costs and the synergy of Looting with so many effects ensure is the case
The ability to bounce any permanent allows decks to cover their bases, gives you the option to position things early or in a waiting game by bouncing a land and it makes sure that you'll get to trigger the discard effect
Every element here works to allow you to outpace and out-damage anyone you come up against