Sometimes this is done during the upkeep, or in response to card draw, in case your opponent draws a split second card (say, Krosan Grip for your Icy Manipulator), countermagic, or an untargetability effect, but in general it's best to wait until the last moment
One of the Dalmatian cards, Lucky - the 15th Puppy, is a great card that adds extra cards to the player's hand if luck is on their side
Ok Summon: Shiva [Borderless] #362 (Magic Final Fantasy) Details All prices are the current market price
Play Sol Ring, bounce Mana Crypt, now have 3 mana
Avacyn, the Purifier Color Indicator: Red Legendary Creature Angel Flying When this creature transforms into Avacyn, the Purifier, it deals 3 damage to each other creature and each opponent