Good Magician Humphrey

{1}{u}: The next time you would put any number
of +1/+1 counters on a creature, instead scry that
many, then draw a card.
{1}{r}: The next time you would scry any number
of cards this turn, instead deal that much damage
to target player, then deal 3 damage to any target.
{1}{g}: The next time a source you control would
deal damage instead put that many +1/+1
counters on target creature you control, then
target creature you control gains trample
until end of turn