If Liberated Livestock's ability causes more than the expected number of tokens to be created (due to an effect such as that of Doubling Season), you may put an Aura card from your hand and/or graveyard onto the battlefield attached to each of the additional tokens as well
The mana curve of an Eshki Temur Roar deck is rather high, so cards like Gwenna, Eyes of Gaea and Selvala, Heart of the Wilds are especially strong since they'll enable you to generate more mana than they cost to cast
A mechanic that grows stronger as you increase its cost
Honorable Mention: Infinity Elemental One of the coolest ideas Ive seen for a creature is Infinity Elemental
Card Name Dig Site Inventory Mana Cost Type Sorcery Rarity Common rules Text Put a +1/+1 counter on target creature you control
6 Ghalta, Stampede Tyrant The Dinosaur King Fan-favorite Dinosaur Ghalta, Stampede Tyrant does so much work with its enter the battle effect that its a little ridiculous how one-sided it can make a game