both Supplant and Demagogue weren't really working so i've altered them.
SUPPLANT, $3, Action-Attack
+1 Card, +1 Action
Each player (including you) returns a card from his hand to the Supply.
He gains a different card from the Supply and gains a differently named card with the same cost that he chooses, putting it into his hand.
despite this being an Attack card, a lot of the time it will be beneficial to other players as well as yourself, hence the low cost.
DEMAGOGUE, $2, Action
Reveal the top 3 cards of your deck. Play one, discard one, and put one on top of your deck.
How do you intend Supplant to work? He returns one card and gains two cards? You wrote:
- He gains a different card from the Supply
- AND gains a differently named card with the same cost that he chooses, putting it into his hand.
There are some ambiguations here. The first gain is not qualified. From a literal reading, your attack could have me to return a Curse and gain a Colony. Colony is a different card from the Supply.
The second gain says "differently named card with the same cost" but it doesn't say whether it should be the same cost as the card returned or the card I just gained. So maybe instead of taking a Colony, I would have returned a Curse and taken an Expand (different card) and a Bank (differently named card with same cost as the Expand).
I have to assume that you made a mistake in phrasing, because letting the opponent gain two cards from one will benefit them more often than not. Further conversation in the thread suggests that it was indeed an error and the intended effect is enfynet's suggestion in #58.
That said, it is still an extremely weak attack. It is entirely symmetrical and may hurt you as much as your opponents! You say in #57 that you are improving your hand, but you aren't improving it any more than your opponents. What if you don't want to change your hand either? You can choose not to play Supplant, but then it is just a dead card in your hand.
Demagogue feels very weak. Issues with non-playable cards aside (i.e. revealing 3 Estates or something), this is semi-terminal minor filtering. I say semi-terminal because you will generally have no idea if you will even find something worth playing. It's more likely that you'll have a better terminal in your hand that you should play instead. Demagogue might be OK as a niche card for decks composed mainly of cantrips.