Eraser

Protection from everything except CMCs of 5
Whenever a player casts a spell, put an
anticipation counter on Eraser. As long as Eraser
has three or more anticipation counters on it, you
may cast spells as though they have flash.
At the beginning of your end step, remove all
anticipation counters from Eraser.
{1}{r}, {t}: Until end of turn, target instant or
sorcery with CMC less than or equal to the
number of anticipation counters on Eraser
gains flashback for its mana cost.