If Wilfred Mott leaves the battlefield after its ability has triggered but before it resolves, use the number of time counters it had on it the last time it was on the battlefield to determine the value of X
You choose whether to sacrifice a creature and which creature to sacrifice as an exploit ability resolves
Theres also cards like Murmurs from Beyond that involve making piles, but no choice from the other player
Building Esper mana bases requires careful attention to dual lands
By paying one white or two life and tapping it, Plankton can make any other creature unblockable, give it hexproof from a specific colour, and, worst of all, give it toxic 1
It's not uncommon for videos of people opening decks of cards, brokering trading deals, or examining vintage decks to accrue hundreds of thousands of viewers