When you draw one, play towards it and do your best to keep it alive, even if that means waiting a couple of extra turns so you have the mana to cast the finisher and hold up countermagic
The key part of that is that it says play, not just cast, which means that you can play Lands if theyre there
If their strength is lower than their willpower, they take damage and damage counters equal to the strength value are placed on the card
If you cast a creature spell this way, it gains haste until you lose control of that creature (or, in rare cases, you lose control of the creature spell while it's on the stack)
Its also not bad in some forms of enchantress, like Tatsunari, Toad Rider
Ugin, the Spirit Dragon gives you a free Lightning Bolt every turn while netting him two more loyalty counters with every use