Sheltering Ancient [Mystery Booster] Elf Assassin Set: The List Type: Sorcery

Set: The List Type: Sorcery Rarity: Rare Cost: {3}{R}{R} After the first postcombat main phase this turn

put a foreshadow counter on Ominous Seas

and sometimes it's downright confusing

Reverse Type: Emblem Artifact creatures you control get +1/+1

"And there are some things

Sheltering Ancient [Mystery Booster] Elf Assassin Set: The List Type: SorcerySet: Mystery Booster Type: Creature Treefolk Rarity: Uncommon Cost: {1}{G} Trample Cumulative upkeepPut a +1 +1 counter on a creature an opponent controls. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)