Beyond the auto-includes Sol Ring and Arcane Signet, the backbone of budget ramp is the full cycle of two-mana Signets (like Golgari Signet) and Talismans (like Talisman of Hierarchy)
While you can just win with creature beatdowns while controlling the game, there is a real threat of drawing TOO many cards
This deck quickly makes up for lost time with massive Eldrazi and other high mana value threats
Like most Magic: The Gathering cards, the value of Minsc & Boo, Timeless Heroes depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Secret Lair Drop)
It doesn't have to be attacking the same player, planeswalker, or battle that Shaun is attacking