Since one of the main goals with those decks is to cast as many spells from exile as possible, Solstice Revelations will fit in perfectly
Dragon from the Revolutionary Army
Mentor lets bigger creatures train smaller ones
Imagine you're playing Esper Control and you look at this opening hand: Temple of Enlightenment, Temple of Deceit, Polluted Delta, Swamp, Island, Negate, Dig Through Time This is a hand that you're thrilled to keep against an opposing control deck like Abzan or Blue-Black Control
Light Moremarshmallon While you control "Shining Sarcophagus", this card cannot be destroyed by battle, also your opponent's monsters cannot target monsters for attacks, except this one