The cards will be added to a players collection afterwards and will be legal to play in other Historic queues
Not only does it discount your instant and sorcery spells, but each one in your graveyard also boosts up its power
Tam, Mindful First-Year Tam, Mindful First-Year provides a lot of hexproof and the activated ability turns it into a mom of sorts like Mother of Runes
Sacred Foundry on the other hand is one card that can provide different mana on different turns, plus, shock lands are a bit easier to come across, and thus shock lands have more availability
The Treasure is already good enough (where you at, Academy Manufactor?), and the exiled card super sweet
The idea is to use ramp effects to power out your towns, triggering landfall effects along the way to grow your board, and closing out with The Wandering Minstrels activated ability