Needing a big creature in play is another obstacle to overcome, but doing so will let you draw a ton of cards and then play every creature you have for free
This is also the first time the TCG will release Red-Purple multicolor Leader Cards, in which all three abovementioned captains will be part of
But outside of Commander, Congregate still is pretty good
One more thing, a helpful deckbuilding resource you might like is Mana Gathering which shows you categories of lands and is consistently updated
The abilities here allow you to add ink while drawing, without having to ink the card itself, allowing you to play late-game cards quicker and gain an advantage
Whenever a creature you control with a +1/+1 counter on it dies, return that card to the battlefield under your control at the beginning of the next end step