Consecrated Sphinx (Invocation) [Amonkhet Invocations]Set: Amonkhet Invocations Type: Creature Sphinx Rarity: Mythic Cost: {4}{U}{U} Flying Whenever an opponent draws a card, you may draw two cards.

where X is the number of tapped creatures you control

Of course they do

Set: Tenth Edition Type: Enchantment Rarity: Rare Cost: {1}{B}{B}{B} Whenever a creature you control dies

that player may choose any number of tapped blue creatures they control and pay {4} for each creature chosen this way

and what to do when either goes wrong

Set: Pro Tour Promos Type: Legendary Creature — Dragon Rarity: Rare Cost: {3}{G}{W}{U} Flying

"You might as well try to stop the waterfall

Set: Legends Type: World Enchantment Rarity: Rare Cost: {R} At the beginning of each player's upkeep

" —Lim-Dûl

Whenever Unesh

" —"The Enchantress

Set: Portal Three Kingdoms Type: Legendary Creature — Human Soldier Warrior Rarity: Rare Cost: {5}{R} Haste