Lets take a slightly weird but easy one as a closing example
Love this cheap mana enabler early
Azlask, the Swelling Scourge Brisela, Voice of Nightmares Emrakul, the Aeons Torn Emrakul, the Promised End Emrakul, the World Anew Hanweir, the Writhing Township Herigast, Erupting Nullkite Kozilek, Butcher of Truth Kozilek, the Broken Reality Kozilek, the Great Distortion Ulalek, Fused Atrocity Ulamog, the Ceaseless Hunger Ulamog, the Defiler Ulamog, the Infinite Gyre Zhulodok, Void Gorger
What makes this card so useful in a variety of decks is that you can use any one Monster as material for its Summon
Roles are colorless Aura enchantment tokens that can give positive (or negative) abilities to a creature
If the cunning opponent controls Trinisphere, and you cast a spell by paying Flashback cost, you will have to pay the Spheres tax if the mana part of the total cost of the spell nets for less than three