As you can tell, there're plenty of choices to pick from
If you were designing a deck with cards that create a high number of creature tokens, such as Scute Swarm, the best way to find cards that combo well would be to type "when a creature enters the battlefield" into the search bar
EU LP to US MP/HP ), with photo examples for each grade
One of the most powerful ways to do so is by making them indestructible
Meanwhile, Reckless Ringleader does work well with Krenko, Mob Boss, which really likes having haste, but considering that Goblins already have Goblin Chieftain and Goblin Warchief, which perform the same role but in a much more powerful way, it's hard for me to imagine the Goblin tribe finding room for a one-mana 1/1 with fringe upside
In early design, I put the card Soothsaying from Mercadian Masques in the file as it felt a perfect fit for the future feel