As long as you control three or more legendary creatures, Kolvori gets +4/+2 and has vigilance.
, : Look at the top six cards of your library. You may reveal a legendary creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
As The Ringhart Crest enters, choose a creature type.
: Add . Spend this mana only to cast a creature spell of the chosen type or a legendary creature spell.
Kolvori is a mono-green legendary-tribal (superfriends-style) engine: flood the board with legendary creatures to turn Kolvori into a cheap 6/4 vigilance attacker and fuel its card-advantage activation. You ramp early, deploy a parade of legends that each bring value, and grind opponents out with superior card flow before closing via combat or a big finisher. The Ringhart Crest side gives you a mana rock fallback that ramps your legendary spells.
Repeatable card advantage digging six deep for legendary creatures every turn
Cheap, recurring engine that's hard to fully shut off (front side or back side as a rock)
Mono-green consistency with strong ramp and access to powerful legendary creatures
Synergizes with the deep pool of value legends across green
Needs three legendary creatures out to be a relevant body, so it's fragile early
Card draw only finds legendary creatures—dead activations if you whiff or want non-legends
Mono-green lacks interaction, removal, and counterspells
Vulnerable to board wipes that reset your legend count and turn off the buff
No inherent evasion or protection on a value-oriented commander