While the card is in your hand you can cast one half of the card, and while the card is in your graveyard you can cast the other half
To implement dusting, Wizards would probably make other adjustments to the economy, and Wizards isn't known for making Arena more generous
In all seriousness, theres tons of incredibly effective permanents to blink for absurd value, so I hope you experiment with your favorite enter-triggering cards
Even if you can't activate the freerunning cost, this type of effect usually costs four generic and a black, so it's already coming at a slight discount
I use the last piece of removal in my hand
For the most part, these decks align with the typical characteristics and themes of their color combinations