Kalamax, the Stormsire springs to mind, especially since you want Kalamax to be tapped and Leyline Dowser can do just that
This card was shaping up to follow its Japanese print's price by being one of the most sought-after modern cards, but thankfully, Journey Together was not only a fair set to pull from, but also had less scalper excitement around it
Theres a growing subset of creatures who balance out a lower-than-usual cost by entering play asleep with a bunch of stun counters on them: copy them with Alteration, and you can turn your 1/1 into a full-power Arixmethes or The Watcher in the Water
Tyvar the Bellicose is a four-mana Black and Green 5/4 that gives your attacking elves deathtouch until the end of the turn
Base color recommendations: Gold, Bronze, Metallic Sapphire Sharpie (sky blue), Metallic Emerald Sharpie (green), Metallic Ruby Sharpie (a pinkish red), Silver (my least favorite option)