Poison Ivy, Eco-Terrorist

Landfall — Whenever a land you control enters, create a 0/1 green Plant creature token. Put X +1/+1 counter on it where X is each Plant creature you control.
Return to Earth — Sacrificed lands under opponents control return to the battlefield tapped under your control. Whenever a Plant creature leaves the battlefield, you may search your library for a basic land and it enters the battlefield tapped.
When Poison Ivy enters the battlefield, all Plants creatures you control have toxic 1 until end of turn. (Players dealt combat damage by that creature also get a poison counter.)


The Joker, Clown Prince of Crime

Menace
Jokes on You — You may remove 3 Joker Venom counters among all permanents. Return The Joker to the battlefield under its owner control.
Whenever you deal combat damage to a creature, prevent that damage and put that many Joker Venom counters on it.
If there are 5 or more Joker Venom counters, that creature’s owner faces a villainous choice — you gain control of creature and it is a Clown in addition to their other types, or put a +1/+1 counter on The Joker and that player loses life equal to The Joker’s power . Remove 5 Joker Venom counters on creature.

Green Lantern, Hal Jordan

Flying
Green Lantern enters with X energy counters, where X is the total converted mana cost of all artifacts you control.
{T}: Create a token that’s a copy of target artifact you control, except its name is now Light Construct. Remove energy counters equal to the converted mana cost plus 1 of target artifact.
Green Lantern has indestructible as long as he has energy counters.
If there are no energy counters on Green Lantern at the beginning of your end step, destroy all Light Constructs


Edward Nygma, Arkham Asylum Inmate

When Edward Nygma enters the battlefield, each player investigates. (Create a Clue token. It’s an artifact with “2, Sacrifice this artifact: Draw a card.”)
When you deal combat damage to a player, destroy target artifact under that player’s control and it returns tapped as a Clue in addition to its other types. (It gains the ability to “2, Sacrifice this artifact: Draw a card.”)
Transform Edward Nygma when there are 10 Clues on the battlefield.

The Riddler, Enigmatic Schemer

Riddle Me This — Whenever you investigate, each opponent investigates instead. (Create a Clue token. It’s an artifact with “2, Sacrifice this artifact: Draw a card.”)
When Riddler enters, investigate. All Clue tokens enters with 3 time counters, at the beginning of each upkeep, remove a time counter. 
When time counters on Clue tokens under opponents control become 0, Riddler does X damage to player where X is the number of Clues under their control.  Destroy Clue tokens with 0 time counters.
Clue tokens under your control cost 1 less to activate.
When there are no Clues tokens under opponents’ control, exile Riddler and return him transformed under his owner’s control.

The Riddler, Enigmatic Schemer // Edward Nygma, Arkham Asylum Inmate

Clayface, the Perfect Actor

Quick Change — You may remove copied abilities from Clayface and gain 2 life.
Whenever you cast a permanent spell, you may pay 4 life to exile Clayface and return him to the battlefield as a copy of that spell. Clayface retains his text in addition to the copy and is still named Clayface.

Talia al Ghul, Daughter of the Demon

Deathtouch
Whenever Talia attacks alone, put a +1/+1 counter on target creature.
Whenever Talia deals combat damage to a player, that player faces a villainous choice — exile top of player’s library and you may cast it if it is a spell with mana cost equal or less than Talia’s power without paying its cost, or return a card from your graveyard to the battlefield.
