Tenuous Truce is a rare Enchantment — Aura card from Bloomburrow Commander (BLC), collector number 159. Current market price: $0.36, TCGplayer market prices via Scryfall.
Enchant opponent At the beginning of enchanted opponent's end step, you and that player each draw a card. When you attack enchanted opponent or a planeswalker they control or when they attack you or a planeswalker you control, sacrifice this Aura.