If the defender creature has power above 0, it will deal damage when blocking
The original Polymorph has you destroying a creature, with the creatures controller revealing cards until they find another creature and put that one into play
Luminous Broodmoth does sweet work alongside blink effects, since you can reset a creature thats come back from the graveyard with a flying counter
Siphon Insight I havent seen Siphon Insight outside of Alchemy on MTG Arena, which is interesting considering that its not a card exclusive to it
(Put the top card of your library into your graveyard.) Craft with Island and three generic, one blue mana (Three generic, one blue mana, Exile this artifact, Exile an Island you control or an Island card from your graveyard: Return this card transformed under its owners control
Otherwise, put a +1/+1 counter on the creature, then put the card back or put it into your graveyard.) You may play an additional land this turn