Sentinel Spell-Bearer

Sentinel(Attacking doesn't cause this creature to tap,
and it can't be tapped by a spell or ability resolving. It
can still {t} or be tapped as part of paying of a cost.)
{t}, Discard a card, Return Sentinel Spell-Bearer
to its owner's hand: Target spell or ability gains
split second. If an artifact or an enchantment was
discarded this turn, each player may scry 1. Any
player who does mills 1 unless they pay {1}. If no
one mills any cards this way, draw a card.