6 mana (3BGU) for a beefy 6/6 is a fair enough trade, but its real value comes from its ability to play a land and a permanent spell of each permanent type from your graveyard on each turn
This Standard format is home to more insanely powerful four, five, and six mana spells than anything I can remember
And the red/green delirium mechanic benefits from manifest dread's mill-like effect to power up easily.
Slap on cards like Bloodforged Battle-Axe and Goldvein Pick and your combat step generates additional Clues to ensure the Senator attacks again the following turn
Chandra Ramunap Red Mono-red is an archetype many would associate more with Amonkhet than Kaladesh in this era
Smee Loyal First Mate, Gaston Arrogant Hunter, and Merlin Self-Appointed Mentor Uncommons: Dragon Fire, Lilo Galactic Hero, and Goofy Muskateer Rare or above: Jafar Keeper of Secrets (Rare), and Ariel Whoseit Collector (Rare) Foil: Friends On The Other Side (Common) A basic pull pack with 2 rares and a common foil