Its an Item that behaves like a Basic but cannot be drawn by a Pok Ball or Pokmon Communication
You now have three colourless mana floating, and can do it again: tap Basalt Monolith to make three more colourless mana, pay three to untap it, copy the ability using two colourless and Rings of Brighthearth, untap Basalt Monolith once, tap it to make three more colourless, and then untap it with the copied ability
The idea is that Skullclamp is purposely put on 1/1 creatures, which are killed by the -1 to Toughness, giving the owner two free cards
Hour of Devastation deals 5 damage to each creature and each non-Bolas planeswalker
This is especially important when new cards get released, and you're trying to find ways that they enhance some of the Pokemon that already exist
Finally, we have Borderless Rude Riders: possibly the most Secret Lair-esque card treatment weve ever seen in Standard