M:tG card similarity search
UB · Legendary Creature — Human Spy
As long as X is in X's owner's opponent's hand, X's owner may cast X and activate X's abilities. That opponent can't cast X and plays with their hand revealed. {U}{B}, {T}: Put X into target opponent's hand. {3}{U}{B}: You may play a land or cast a spell from the hand X is in. If you cast a spell this way, you cast it without paying its mana cost. 2/2
| Name | Mana | Type | Text |
|---|---|---|---|
| Etali, Primal Storm | 4RR | Legendary Creature — Elder Dinosaur | Whenever Etali, Primal Storm attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs. 6/6 |
| Magus of the Mind | 4UU | Creature — Human Wizard | {U}, {T}, Sacrifice Magus of the Mind: Shuffle your library, then exile the top X cards, where X is one plus the number of spells cast this turn. Until end of turn, you may play lands and cast spells from among cards exiled this way without paying their mana costs. 4/5 |
| Sapphire Leech | 1U | Creature — Leech | Flying Blue spells you cast cost {U} more to cast. 2/2 |
| Leshrac's Sigil | BB | Enchantment | Whenever an opponent casts a green spell, you may pay {B}{B}. If you do, look at that player's hand and choose a card from it. The player discards that card. {B}{B}: Return Leshrac's Sigil to its owner's hand. |
| Cosmium Catalyst | Artifact | {1}{R}, {T}: Choose an exiled card used to craft Cosmium Catalyst at random. You may cast that card without paying its mana cost. | |
| City of Solitude | 2G | Enchantment | Players can cast spells and activate abilities only during their own turns. |
| Rock Jockey | 2R | Creature — Goblin | You can't cast this spell if you've played a land this turn. You can't play lands if you've cast Rock Jockey this turn. 3/3 |
| Darksteel Monolith | 8 | Artifact | Indestructible Once each turn, you may pay {0} rather than pay the mana cost for a colorless spell that you cast from your hand. |
| Triton Cavalry | 3U | Creature — Merfolk Soldier | Heroic — Whenever you cast a spell that targets Triton Cavalry, you may return target enchantment to its owner's hand. 2/4 |
| Glen Elendra Pranksters | 3U | Creature — Faerie Wizard | Flying Whenever you cast a spell during an opponent's turn, you may return target creature you control to its owner's hand. 1/3 |