Desert of the Mindful

Desert of the Mindful enters tapped.
{T}: Add {U}.
Cycling {1}{U} ({1}{U}, Discard this card: Draw a card.)

Eidolon of Rhetoric

Each player can't cast more than one spell each turn.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
Counter target spell unless its controller pays {X}.

Enchant creature
You control enchanted creature.

{4}{G}: Rockcaster Platoon deals 2 damage to each creature with flying and each player.

At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Counter target spell unless its controller pays {X}, where X is its mana value.

Draw a card.
Flashback {2}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.

Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.

{6}{U}, Sacrifice Eidolon of Philosophy: Draw three cards.