Wei Assassins [Portal Three Kingdoms] Dragons of Tarkir he destroyed the navigator's tools

he destroyed the navigator's tools and steered the ship to shore by faith alone

Then that player loses all unspent mana and you add the mana lost this way

Set: Commander 2016 Type: Enchantment Rarity: Rare Cost: {4}{G}{G} Whenever an opponent casts a spell

Set: Unlimited Edition Type: Sorcery Rarity: Rare Cost: {X}{U}{U} Target player draws X cards

Set: Unlimited Edition Type: Artifact Rarity: Rare Cost: {1} Mana Vault doesn't untap during your untap step

Wei Assassins [Portal Three Kingdoms] Dragons of Tarkir he destroyed the navigator's toolsSet: Portal Three Kingdoms Type: Creature Human Soldier Assassin Rarity: Uncommon Cost: {3}{B}{B} When Wei Assassins enters the battlefield, target opponent chooses a creature they control. Destroy that creature.