mtg cards like dark ritual (Graphic Novel Insert) - Media Promos grant me the power I am due Divine Ritual (Azorius Dark Ritual)

These medallions give you a cost reduction without tapping, which makes them more rampy than a signet or talisman for colored spells that have a colorless cost as well

You can also sacrifice for mana to Ashnod's Altar, for damage to Goblin Bombardment and then make a mana on arrival with Mana Echoes or Carnival of Souls

This can prevent a powerful ability or enter the battlefield effect from happening, while also destroying the permanent it came from

The end result is that rather than having 37 lands in my Commander decks, in a post-MDFC world, I generally have 3132 "real" (non-MDFC) lands, but thanks to the eight or nine MDFCs, the total number of lands in my decks actually increases to 40 or 41

Glossy sleeves can look nicer but can stick when there is even slight moisture in the air

On the other hand, if you're running Creatures, you suddenly have a very powerful value engine