Echo's ability targets an activated or triggered ability that is on the stack and creates one or more additional instances of that ability on the stack
Hakka, Whispering Raven Alrund has a great affinity for ravens, which he uses as messengers and spies
Marrow-Gnawer The definitive rat typal commander, Marrow-Gnawer transforms quantity into inevitability
Eternal Scourge 3 Creature Eldrazi Horror 3/3 You may cast Eternal Scourge from exile
Heres an example of the kind of deck that got Mind Twist banned: Creatures (2) Lands (21) Spells (37) 4 Mana Drain 2 Counterspell 4 Swords to Plowshares 1 Sol Ring 1 Regrowth 1 Mind Twist 1 Demonic Tutor 1 Braingeyser 1 Time Walk 1 Ancestral Recall 2 Red Elemental Blast 1 Jayemdae Tome 2 Disrupting Scepter 4 Disenchant 1 Recall 2 Moat 1 Mirror Universe 1 Timetwister 1 Black Lotus 1 Mox Emerald 1 Mox Jet 1 Mox Pearl 1 Mox Ruby 1 Mox Sapphire Thats right, one of the most famous, most influential decks of all-time, The Deck, was a Mind Twist deck until Mind Twist was banned
Because they are inside the plane protecting its Core
