Sakashima the Impostor [Mystery Booster] Phyrexian Horse each other creature you control

each other creature you control gets +1/+1 if it has flying

the Mind Flail isn't a creature unless you control three or more permanents you don't own

Put two +1/+1 counters on each of them

“Gix failed

Set: 30th Anniversary Edition Type: Enchantment Rarity: Rare Cost: {1}{U} You may have Copy Artifact enter the battlefield as a copy of any artifact on the battlefield

Sakashima the Impostor [Mystery Booster] Phyrexian Horse each other creature you controlSet: Mystery Booster Type: Legendary Creature Human Rogue Rarity: Rare Cost: {2}{U}{U} You may have Sakashima the Impostor enter the battlefield as a copy of any creature on the battlefield, except its name is Sakashima the Impostor, it's legendary in addition to its other types, and it has "{2}{U}{U}: Return this creature to its owner's hand at the beginning of the next end step."