MTG

The pertinent ruling is apparently

608.2g: If an effect gives a player the option to pay mana, they may activate mana abilities before taking that action. If an effect specifically instructs or allows a player to cast a spell during resolution, they do so by following the steps in rules 601.2a-i, except no player receives priority after it's cast. That spell becomes the topmost object on the stack, and the currently resolving spell or ability continues to resolve, which may include casting other spells this way. No other spells can normally be cast and no other abilities can normally be activated during resolution.

EDIT: the above rule is why you can cast spells with Gix. There's a ruling on Xanathar that says "Xanathar doesn't change when you can cast spells [...] You must still follow all normal timing rules"

White: Heliod https://manabox.app/decks/CFRv24kLT5Sk1WVix77sOA
Blue: Azami https://manabox.app/decks/bDQeB2UiSeex6Kl5fle0Yw
Black: Endrek Sar https://manabox.app/decks/OOXYqDmRT_2P9sR62YGUcw
Red: Krenko https://manabox.app/decks/1aKHtUfTT_u9F4Lm5-2Nzg
Green: Azusa https://manabox.app/decks/kav95jqtQsiABwNQsI61Jw

So I posted this originally on an edh community but heard there is a more active user base here. I put together a Star Format Commander set. I have yet to play test so I am not sure how balanced everything is currently. I tried to make the decks on theme to their basic color identity, but that made balancing a little hard. The decks were made with only cards I already owned, so if some obvious things are missing that is why. Also I know there a few illegal cards for Commander in some decks, but wanted a fun factor and since this is a cube-ish type thing meant to only be played togehter I figured it was fine. It was a blast to put together and hopefully will be fun to play. Let me know what you guys think.
Bonus red deck in case it's just too hard for krenko to kill 2 opponents. Hidetsugu: https://manabox.app/decks/68Hkf2kJQr-X-RuyGakPZw

Or, Play Some Damn Basic Lands, Fool

See title, for example [[Generous Patron]]. It's a long running question I had with a friend, and we kind of came to the conclusion that the answer is no because the creature doesn't yet exist when the ETB resolves.

But I gave it some thought again because it feels so weird that so many cards have this kind of effect and supposedly it doesn't get triggered. Does anyone have a definitive answer to this? Would be great if you can refer to the official rulings.

My favorite deck I own is my Jasmine Boreal of the Seven all old border deck. Lots of vanilla creatures and an enchantress subtheme for card draw. Its fun to work within the limits of old border only, and its a great excuse to look at tons of old cards.

Some favorites in the deck are Inheritance, Festival, and Moss Monster

Do you have any gimmick/special rules/unique ways of building a certain commander?

Not exactly MTG but a pretty random related product coming soon for those into mysticism/oracle cards:

From the team behind The Dungeons & Dragons Tarot Deck comes this officially licensed oracle deck comprising 52 all-new illustrations that celebrate the characters, creatures, and lore of the world’s largest trading card game.

Inspired by Theros, the plane where monsters prevail, mortals endure, and heroes ascend, this Magic: The Gathering-themed deck features exclusive art of Jace, the Planeswalker; Hythonia, the legendary gorgon; and well-known creatures such as the Pegasus, Chimera, Sirens, and more.