You choose and play the card while Evercoat Ursine's last ability is resolving and still on the stack
The easiest way to think of it is this: if you know you always want to see at least one copy of a particular creature or spell (or anything else) each game, then you want four of it
Yargle and Multani combines the raw power of Multani, Yavimaya's Avatar with the meme energy of Yargle, Glutton of Urborg
The five-ink Sapphire cards Protective Embrace ability means that your opponents cant target any characters with Ward except to challenge them, stopping actions or powers that might instantly banish them or force them to be exerted
The biggest reward of all, in my opinion, is that the cost of your subscription gradually decreases over time
With Brimaz running around, its back up to $3 again