Use cases: Gift item, party favor, seasonal collectible, casual play enhancement, add-on for collectors
The first aims for an inexorable long game, carefully timing blink spells to safely reuse ETB effects, often countering single target removal or turning evenhanded board wipes into events where you come out far ahead of the rest of the table
"Blocks?" And finally, the last note, and a very important one: sometimes your opponent just won't block
Evolution mid-battle not only cures Pokmon of all status effects, but enables the creature to use powerful new abilities and have more hit points (HP)
Few of Magic: the Gathering's many formats are as flexible as Commander
Ptolemaeus granted Rank 4 XYZ decks the ability to summon Rank 5 monsters, which offered them a level of versatility they really didnt need