Adding +3/+0 is already good, but it's the combination of Trample and pseudo-Lifelink that are the real prizes here
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Wind Crystal's first ability)
Transmute Artifact can effectively trade up any artifact, even a token, for literally anything else in your deck, making it a widely sought-after card for any artifact deck looking to splurge a bit
Reconnaissance Mission Reconnaissance Mission cycles for 2, or casts for 4 as an enchantment
So, we're counting down the most impressive Commanders that black and white have in their wheelhouse