In the old days, the baseline for mana rocks was to actually produce mana the turn they came into play, like Mana Vault, Mana Crypt, the Moxen, and Grim Monolith
Charizard takes the cake as the best one, though, thanks to its game-closing attack Combustion Blast
You dont really get full days off
In addition to his three keyword abilities, Knuckles also has the same ability as the popular red staple, Professional Face-Breaker
The final effect gives you the option to discard your hand and draw four cards every time the Ring tempts you, allowing you to draw a fresh set of cards if you're short, or to throw lots of creatures into your graveyard if you're leaning into Sauron's role as the Necromancer