Whenever Phenax or another Rogue you control deals damage to a player or planeswalker, each player mills two cards.
{1}{U}{B}, Exile five other cards from your graveyard: Return Phenax from your graveyard to the battlefield transformed. Activate only as a sorcery.

Indestructible
As long as your devotion to blue and black is less than seven, Phenax isn't a creature.
At the beginning of each end step, each opponent mills X cards, where X is the number of cards put into their graveyard from anywhere this turn. You gain life equal to the number of cards milled this way.

Whenever Rooftop Slink deals combat damage to a player, you may have each player discard a card.
Cybersoul {3}{B}

Flying
Whenever Synthetic Specter deals combat damage to a player, that player discards a card. Then if they have no cards in hand, put a +1/+1 counter on Synthetic Specter.

Whenever a Ruin you control becomes spellcharged, it gains haste until end of turn.
Spellcharge 2