The actions they may perform are as follows: Play a card players may play a card from their hand, which has a cost in the top left corner (the Emporio.Ivankov card shown above has a cost of 5)
Most decks have at least a handful of incidental recursive effects, so just make sure you're not shutting off your own cards by playing this
Basically, its impossible not to see the difference: the fake has a dotted pattern while the real is solid black
The 0-loyalty ability can be a finisher if youve already got a wide enough board, which is why I see this Ajani as more of a support piece, personally
Boros Reckoner, Stuffy Doll, Repercussion (careful with that one), Spiteful Sliver, Wrathful Red Dragon, Pariah, Pariahs Shield, as well as Dictate of the Twin Gods and other backup doubling effects
This means Chittering Doom is unaffected, for example, by a planar die roll, but is affected by the d20 of Sword of Dungeons & Dragons