If you choose to cast any spells, you do so as part of the resolution of that ability
*Smiles in Orzhov* Deathleaper, Terror Weapon Flash and haste are my two favorite keywords to see on the same card
: Put a +1/+1 counter on this creature, then you may reselect which player this creature is attacking
Challenging deck-building assumptions is going to give players tons of room to experiment and be rewarded, in everything from Limited to Legacy
Nadu, Winged Wisdom Nadu, Winged Wisdom also enters broken territory, with ramp potential so unbounded that it almost immediately ruined formats and subsequently hit the banlist
Pretty much all of these cards are double-sided, featuring the characters turning into their alter egos on the back