Endless Riches

You skip every Draw Phase you would have for as long as Endless Riches remains on the board.

"Skip your Draw Phase" is a passive ability and a replacement effect that replaces your Draw Phase with nothing.^364.2444.1.a Passive abilities of permanents become active when the permanent enters the board and are typically active only while it remains there.^359.2.a365.1 Once Endless Riches leaves the board, this ability is no longer active, so your later Draw Phases occur normally.

No, Endless Riches does not allow you to hide cards from your trash.

Endless Riches grants permission only to play cards from your trash. Hiding is a separate action from playing.^811.1.c.1 You can normally hide a card only from your hand or chosen champion zone.^811.1.b

Ordinarily, it is recycled to the bottom of its owner's main deck.^{417.1417.1.a417.1.c} The "then recycle it" text on Fizz, Trickster and Kai'Sa, Evolutionary creates a delayed replacement effect for a finalized spell leaving the chain other than through its own effect.^391.3.a Endless Riches creates another replacement effect that would replace the spell going to the trash with banishing it.^369.1

When both replacement effects apply to a spell that would go to the trash, the spell's controller chooses the order in which to apply them.³⁷² Either order recycles the spell.

• Fizz or Kai'Sa first: The spell is recycled instead of going to the trash, so Endless Riches no longer applies.
• Endless Riches first: The spell would be banished instead of going to the trash, but it is still leaving the chain, so the delayed replacement replaces that event with recycling it.^370.2

One boundary applies: if the spell's own effect instructs it to leave the chain during resolution, follow that instruction, except Endless Riches still banishes it if that instruction would put it in the trash.^391.3.a369.1