Spy Combo wants to flood the board with ramp creatures and dig for Dread Return and Balustrade Spy loops; our best plan is to race and protect our own key permanents rather than try to fight their engine piece-by-piece. Tamiyo's Safekeeping protects a key attacker or blocker from any removal they draw (though they have little in their maindeck) and gains 2 life as a small bonus. Red Elemental Blast and Ancient Grudge have no profitable targets since this deck has no blue spells and minimal relevant artifacts worth the card. We trim the slowest card-advantage pieces (Bitter Reunion, Melded Moxite) since this is a race we want to win quickly rather than grind out.