Ninja Boy allowed you to power up a weak creature on your bench by putting lots of Energy onto it and then switching it out for a powerful Basic Pokmon
Theres definitely a place for gameplay like this, but a lot of people will be left feeling like they sat down and watched you play all of the Magic at the table
While it isnt technically an infinite combo on its own, this loop becomes a deterministic chain that lets you assemble whatever you need to close out the game
Rulings 2013-04-15 If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, the new top card won't be revealed until you finish doing so
You can drop this before counters are up and start drawing, and it works for early mana rocks like Arcane Signet and Fellwar Stone and even Sol Ring
SM and the first year of SwSh ETB sleeves feel alright, but the edges are rough, they can start to cut up your skin after a few games just from shuffling your deck