You need to evaluate when healing is worth it versus drawing more threats
Commander Kenrith, the Returned King : All creatures gain trample and haste until end of turn
You can plan a lot better when you have the Time Walk in hand and will gain a lot more from casting it than you do most times with Mastery
And it does what Selesnya does: Toss +1/+1 counters around, which in turn makes coven fairly easy to achieve
With breathtakingly beautiful artwork from Joseph Meehan, this card is surely the best-looking version of Scapeshift, and Commander combo players would be glad to have a copy of this in their land shenanigans combo deck
Heck, you can drop most of the tricks and just go for a full-out Sultai Counter deck, merging the -1/-1 Counter tricks of Hapatra, Vizier of Poisons with the +1/+1 Counter power of Pir, Imaginative Rascal & Toothy, Imaginary Friend