Scion of Draco also fits multicolor decks pretty well, being able to give plenty of combat-related bonuses to gold creatures, and surprise, surprise, Leyline of the Guildpact also helps with these bonuses, extending them to all creatures including the Scion itself
For example, if you put Twenty-Toed Toad onto the battlefield and then put Spellbook (an artifact that says you have no maximum hand size) onto the battlefield, you would have no maximum hand size
Apart from being solid, on-tribe creatures, Regal Leosaur, Cubwarden, and Snapdax, Apex of the Hunt offer some sneaky extra upside by allowing us to (essentially) have extra copies of powerful legends like Rin and Seri, Inseparable or Kaheera, the Orphanguard on the battlefield by mutating on top of them to change the name
That calculation was done by using the population (size of the deck), number of successes in the population (amount of mana sources), and the sample size, which is the number of cards youve drawn from the deck by the time you reach the target turn