Also doing heavy lifting with Kenrith: Biomancers Familiar is another Training Grounds that can actually attack too, but being a creature makes it much more vulnerable in a game of Commander than an enchantment which is why Training Grounds gets the #1 spot
They have a strong sense of deck identity
Kudos to the design team over at Wizards of the Coast for making this variant and giving this an evergreen print run making this in tandem with their upcoming sets, in this case Dominaria United
Sink into Stupor / Soporific Springs Disruption and mana consistency come together in Sink into Stupor, offering a bounce effect on one side and a blue-producing land on the other
(It's an artifact with two generic, Tap, Sacrifice this artifact: You gain 3 life.) Ygra, Eater of All Three generic, one black, one green legendary creature Elemental Cat 6/6 Mythic Rare Ward: Sacrifice a Food
Part of this is only having a single copy of it and everything else making you unable to rely on the Tog to do what you want