Critically, Im only looking at creatures that can recur themselves multiple times
$60 "Ninjas" The first list is all about ninjutsu'ing out huge haymaker "ninjas" that provide the deck with card advantage / removal / utility all while being massive beater win conditions
But it should be obvious how much more explosive you can be when you can make sacrifices which are mana-positive and require no external sac outlet
Dragons of Tarkirs Dragonlords As the name implies, Dragons of Tarkir was all about dragons, and the five factions were each commanded by one of these dragonlords
Temple Altisaur Temple Altisaur is home to an extremely impactful ability, especially if your Dino deck is home to cards with Enrage , which offers up a helpful triggered ability if your creatures are dealt damage
Then, something like [c]Past in Flames[/c] will give them all flashback, so you can cast each one of them a second time