Illusory Ambusher does its job as something you can use to gain card advantage
In testing its the probably the most consistent card, and it makes rough or bad decks good
This is a super rare counter type, and at three mana, Arwen is probably the easiest way to get it onto the board
Plus, once more cards start entering and circulating in the secondary market, many of these inflated prices should drop significantly
If an activated ability of a creature you control costs no generic mana to activate (for example, if it costs , it costs, or it costs only nonmana actions such asor "Sacrifice a creature"), Training Grounds simply won't affect it
most of the effects return creatures or nonland permanents to their owners hands, rather than removing them permanently