What's Next So, where is MTG Arena headed from here
What you want to be using this for is either top of library manipulation first, or as a protection spell for a key piece that gets targeted by removal
(They have "Whenever a creature you control enters, if it has greater power or toughness than this token, put a +1/+1 counter on this token." They see this creature enter.) : Create a 0/1 colorless Eldrazi Spawn creature token with "Sacrifice this token: Add ." Creature - Eldrazi Drone Tendershoot Dryad Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) At the beginning of each upkeep, create a 1/1 green Saproling creature token
This time, when it resolves, since it wasn't cast from your hand, it will enter the battlefield (and you'll have those two Athlete tokens from casting the Baller twice)
After Glissa's Retriever has become blocked by a creature with power 3 or greater, reducing the blocking creature's power won't cause Glissa's Retriever to become unblocked