(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
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
However, with the basic Swamp requirement, your mana base needs to be almost exclusively basic Swamps and Cabal Stronghold to really make Cabal Stronghold function, which probably isn't worth the cost in Modern, where splashing a second color and playing utility lands likely give you more power than maybe making extra mana with Cabal Stronghold, and it might not even be worth the cost in Standard
Thats pretty good, and its definitely an upgrade over a simple Cancel
While Moanas one point of strength isnt much, you likely wont want to be using her to challenge anyway
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