Ledger Shredder will certainly trigger multiple times a turn in Commander and in Eternal formats
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
Casting a string of one-mana spells is very color intensive, and while you can take a ton of damage from your lands to find multiple copies of Steam Vents, thats a significant liability against aggro strategies
Luckily, these decks cover a variety of Grixis strategies and themes, showcasing the entirety of what these three colors can do together
He can grant a raven the ability to fly between realms to carry his messages and seek out secrets
