The amount of card selection here is not bad for two mana, and the flexibility of being able to just name a card in your hand if you dont like the cards you scry means youre nearly guaranteed to get that value
Reveillark's death trigger will activate again, you can repeat the whole loop as many times as you want: use Reveillark to bring Karmic Guide back, use Karmic Guide to bring Reveillark back, sacrifice them both to Phyrexian Altar
Regal Force Similar to Elves in Legacy, Mono-Green Devotion uses a multitude of green mana producers to reach a critical mass and end the game with Craterhoof Behemoth instead
Everything I said about Exploration is true here, and then some
A few of these sites include: The Secondary Market There are two major secondary markets to purchase artist proofs
Thats the power of collectible card games and a reminder that sometimes, you never truly know how a market will evolve.