Once you have four different card types in your graveyard, Dragon's Rage Channeler gains +2/+2, flying, and has to attack each turn if able
Yoshitaka Amano illustrated this Double-faced Kefka, Court Mage/Kefka, Ruler of Ruin and Terra, Magical Adept/Esper Terra
The first, Gather Around, says that whenever you play a character, she gets +1 lore this turn
They can also be effective against creature-heavy aggressive decks as well, though there I'd rather have a removal spell or even a good creature of my own
This plays great with Proft's Eidetic Memory as well as cards like Marauding Mako
This is because they contain more value and excitementa guaranteed foil and the chance to open up to four rares