Thought Scour puts a random card into your hand, Opt lets you choose a known card or the mystery box, Sleight of Hand is the same two-card choice with an open mystery box, and Serum Visions lets you keep both or neither of the two cards you see
They can range from overwhelming your opponents with creatures to executing a game-winning combo, or creating an infinite supply of, mana, creatures or damage
Multiple creatures can block a single attacker, but each blocker can only block one creature
In a deck with synergies the card is a combo kill machine
T, Tap an untapped creature you control: Transform Town Gossipmonger
How Many Artifact Lands Can You Play Per Turn