These cards are fairly common in Standard decks, although less so in MTG 's most ultra-competitive formats like Modern and Legacy
Combined with deathtouch, they serve as both an unstoppable offensive force and a defensive deterrent that no one wants to block
Llanowar Elves and friends), Dionus essentially doubles the value of all your mana dorks by letting you tap them twice per turn
(It is not, however, Outpost Siege, a mistake an earlier draft made caught by an eagle-eyed commenter!) This deck, on the whole, suffers from Way-Too-Many-Tapland-Itis, and its ramp package barely mitigates that
The Mimeoplash can enter the battlefield as a copy as one of the creatures exiled this way, whilst entering the battlefield with a number of +1/+1 counters on it equal to the power of the other exiled card