When it does, you reveal the bottom card of your deck, put it on the top or the bottom, then you can draw cards up to 1 per 1000 ATK of the revealed monster and gain 1000 LP for each, if and only if the revealed card was a Dragon, Dinosaur, Sea Serpent, or Wyrm which, all of your monsters are
They are Mox Pearl, Mox Sapphire, Mox Jet, Mox Ruby, Mox Emerald, Time Walk, Ancestral Recall and Timetwister and of course, the most famous card in Magic, Black Lotus
Cid, Timeless Artificer Legendary Creature Human Artificer Artifact creatures and Heroes you control get +1/+1 for each Artificer you control and each Artificer card in your graveyard
Expect people to do anything they can to break the combo purely because of how ubiquitous it is.
With no weakness, resistance against Fighting-type Pokemon, and a free retreat cost, its not the worst
Questions? is an example of a card that is technically both a Filler Card and an Insert Card