M:tG card similarity search
B · Creature — Harpy Mercenary
Flying At the beginning of your upkeep, sacrifice Molting Harpy unless you pay {2}. 2/1
| Name | Mana | Type | Text | 
|---|---|---|---|
| Courier's Briefcase | 1G | Artifact — Treasure | When Courier's Briefcase enters the battlefield, create a 1/1 green and white Citizen creature token. {T}, Sacrifice Courier's Briefcase: Add one mana of any color. {W}{U}{B}{R}{G}, {T}, Sacrifice Courier's Briefcase: Draw three cards. | 
| Glimmervoid | Land | At the beginning of the end step, if you control no artifacts, sacrifice Glimmervoid. {T}: Add one mana of any color. | |
| Mana Chains | U | Enchantment — Aura | Enchant creature Enchanted creature has "Cumulative upkeep {1}." (At the beginning of its controller's upkeep, that player puts an age counter on it, then sacrifices it unless they pay its upkeep cost for each age counter on it.) | 
| Survivor of the Unseen | 2U | Creature — Human Wizard | Cumulative upkeep {2} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) {T}: Draw two cards, then put a card from your hand on top of your library. 2/1 | 
| Initiates of the Ebon Hand | B | Creature — Cleric | {1}: Add {B}. If this ability has been activated four or more times this turn, sacrifice Initiates of the Ebon Hand at the beginning of the next end step. 1/1 | 
| Celestial Vault | 1W | Artifact | {W}, {T}: Draft a card from Celestial Vault's spellbook and exile it face down. {1}, Sacrifice Celestial Vault: Put each card exiled with Celestial Vault into your hand. | 
| Memorial to Genius | Land | Memorial to Genius enters the battlefield tapped. {T}: Add {U}. {4}{U}, {T}, Sacrifice Memorial to Genius: Draw two cards. | |
| Goblin Goon | 3R | Creature — Goblin Mutant | Goblin Goon can't attack unless you control more creatures than defending player. Goblin Goon can't block unless you control more creatures than attacking player. 6/6 | 
| Lethargy Trap | 3U | Instant — Trap | If three or more creatures are attacking, you may pay {U} rather than pay this spell's mana cost. Attacking creatures get -3/-0 until end of turn. | 
| Slinking Serpent | 2UB | Creature — Serpent | Forestwalk (This creature can't be blocked as long as defending player controls a Forest.) 2/3 |