Byrke, Long Ear of the Law Doubling counters is powerful language for Commander players
After looking at every legendary Dragon, I think its a small list
Genesis Ultimatum The Ultimatums were a very popular cycle, and Genesis Ultimatum was one of the more popular ones from the Ikoria half
Ramp can appear in different shapes and forms: Land-Based Ramp (Cultivate, Rampant Growth) Mana Dorks (Llanowar Elves, Bugenhagen, Wise Elder) Mana Rocks (Mind Stone, Basalt Monolith) Treasure-Makers and other artifact token producers (Smothering Tithe, Sarinth Greatwurm) Extra land drops (Exploration, Exploration Broodship) Land Recursion (Crucible of Worlds, Aftermath Analyst) Rituals (Dark Ritual, Mana Geyser) Cost Reduction (Honest Rutstein, Stormcatch Mentor) Eldrazi Spawn & Scion producers (Eldrazi Skyspawner, Kozilek's Predator) Mana Doublers (Mirari's Wake, Groundchuck & Dirtbag) Temporary mana abilities (firebending) This ranking will cover many of these forms of ramp, but will leave some more specific ones like Treasure-makers to their own separate list
With it, you can alter the cards on the top of your deck, and ensure that you will have a target to use for Summon Undead in your graveyard
