So if you wanted to play Void Beckoner, for example, you could cast Spacegodzilla, Void Invader instead for the same mana cost and with the same abilities, power, and toughness
Cerberus is a nice summon saga that allows you to copy an instant or sorcery for free with the second chapter and twice on the third one
I like control builds of Greasefang better in 2-player formats, but in Commander sometimes it works best to just build a kind of vehiclepalooza deck that uses Greasefang as added value instead of as a combo kill
As long as Ozai, the Phoenix King is on the battlefield, you'll keep unspent mana as steps and phases end (although it will become red)
Magic: The Gathering is already full of hidden information and back-and-forth interaction, but the morph mechanic, first introduced in 2002's Onslaught set, introduces an extra layer of secrecy and trickery to the game