Chaos Orb [International Collectors’ Edition] Gateway 2008 then add one mana of

then add one mana of any color

Set: Legends Type: Artifact Creature — Shapeshifter Rarity: Rare Cost: {4} {0}: Change Sentinel's base toughness to 1 plus the power of target creature blocking or blocked by Sentinel

Sometimes I don't know if it's them or me thinking

reveal Nexus of Fate and shuffle it into its owner's library instead

Set: Collectors’ Edition Type: Creature — Dragon Rarity: Rare Cost: {4}{R}{R} Flying (This creature can't be blocked except by creatures with flying or reach

Chaos Orb [International Collectors’ Edition] Gateway 2008 then add one mana ofSet: International Collectors Edition Type: Artifact Rarity: Rare Cost: {2} {1}, {T}: If Chaos Orb is on the battlefield, flip Chaos Orb onto the battlefield from a height of at least one foot. If Chaos Orb turns over completely at least once during the flip, destroy all nontoken permanents it touches. Then destroy Chaos Orb.