I might give a lot of weight to instant-speed trample effects, but I've won too many games with them to underrate this activated ability
If you want a pro's opinion on how to build a deck with a solid mana base in a format like Modern, Reid Duke has a course that touches on this
You use Wrenns -3 ability to make a 5/5, use that 5/5 to crew the Chariot, and then use the Chariots ability to make another 5/5 during combat
These are your game-winners
Universal Compatibility: Designed for standard PSA slabs, and fitting any slabs of the same size, make it a versatile choice for collectors of all types
This card costs X and three green, has Convoke - meaning you can tap creatures to help you pay for the cost - and you can search your library for a creature that costs X or less and put it into play at instant speed