If his deck is full of cheap removal, then the chance to try and get in damage after you've cleared that Sable off means it's probably right to hold back, whereas if his deck is full of 3/2s then you'd want to lean toward trading off
It gives indestructible if the creature is green, flying if its white, and +1/+1 for each colormaking it a perfect fit for hybrid decks
Castle Ardenvale and Memorial to Glory are lands that produce tokens, which have synergy with your commander
For two mana, you get to grab a creature from the top five cards of your deck, exiling it, and letting you cast it this turn
However, even rare Yo-Gi-Oh cards can be sleeved for protection and wait for their price to rise to sell
The final design would keep the same Pokedex entry but would remove calling it a legendary pokemon