The upkeep step is before the draw step, after the untap step. Because the turn has already begun, creatures put onto the battlefield during your upkeep won't be able to attack or pay a {T} cost this turn.
16-03-2018
wotc
Hell's Caretaker can be the creature sacrificed to activate its ability, but it can't be the target of its own ability.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.