If this is news to you, then first thing's first: you should check out our Revitalizing Standard article
There's not a single way you can build Sisay, since there are multiple combo lines you can go for that all will close a game in no time
If the target creature is already tapped as Tranquilize resolves, you will still put three stun counters on it
Target player puts the top four cards of their library into their graveyard
With only one week to go before spoilers for Avatar: The Last Airbender kick off, most Magic: The Gathering players werent expecting any big news this week
There are safer ramp options, in my opinion, in green: Farseek - Can take the place of Selesnya Signet Nature's Lore - Can replace Talisman of Unity Kodama's Reach - Can Replace Commander's Sphere I say replace, but you can always up your ramp suite by a couple cards instead.