Whispersilk Cloak [Tenth Edition] Reptile/Blue Flare Set: Eighth Edition Type: Artifact

Set: Eighth Edition Type: Artifact Rarity: Rare Cost: {2} At the beginning of each player's draw step

Stage 3—(2/4) {U}: Loopy Lobster gets +1/-1 until end of turn

Set: Time Spiral Timeshifted Type: Creature — Efreet Rarity: Rare Cost: {3}{R} Protection from white

but I believe a more mundane power source might suffice

Whispersilk Cloak [Tenth Edition] Reptile/Blue Flare Set: Eighth Edition Type: ArtifactSet: Tenth Edition Type: Artifact Equipment Rarity: Uncommon Cost: {3} Equipped creature can't be blocked and has shroud. (It can't be the target of spells or abilities.) Equip {2} Such cloaks are in high demand both by assassins and by those who fear them.