The downside of Tocasias Welcome is that it will only trigger once a turn, but with a way to create tokens at instant speed or by casting cards with flash, you can trigger its draw effect on your opponent's turn
This card also sees play in decks that require many cards in graveyards, so creatures like Necrotic Ooze and Trazyn the Infinite can do work
Xenagos, the Reveler is the planeswalker iteration of this character
If you find a way to exploit his coin flipping ability, I'm sure it can be an incredibly powerful one, and the fact that it will work on each turn makes it even better
First introduced in Wilds of Eldraine, the Adventure mechanic allows players to cast the Adventure half of a card, then later cast the other half from exile once the Adventure resolves
2022-02-18 Once you activate a ninjutsu ability, no player can affect that ability by removing Satoru Umezawa from the battlefield