Alternate Deck name: "Big Knucks!"
So this is a project I wanted to engage in- To make a set of 10+ super-budget 60-card decks that are simple, relatively easy to play, relatively easy to understand, and bring across the fundamentals of how Magic Works. We've since gone way past 10, with tons more in the works, and I've really enjoyed the challenge of trying to make these decks easy to play and understand, fun, and all under a $15 budget, sideboard included.
The main goal here is that you could easily build these deck for a low cost and use them as an easy introduction to how magic works, to teach a group of new players both how to play, and give them a sense of Why, a sense of what fun things they're getting into. These decks aren't gonna be particularly good, or even legal in any particular format if it stops me from including a card I think is good for the deck, but they should be fun and interesting without being too hard to get into. They should be an easily-accessible example of how fun Magic: The Gathering can be.
I've had to re-make this deck a few times to get it to work, and it's still barely in-budget, but hell with it- I love Big Knucks, I love Midrange decks that turn all of their creatures into cantrips for value, and I love the fact that I stopped giving enough of a shit to keep me from throwing freaking flametounge Kavu into my red midrange decks to teach new players that yes, that card is really really good.
As for budget: Maindeck cost is currently at ~$12 (according to the middle blue numbers on this very site under estimated value), sideboard at about ~$3, so we're just barely in-budget, and that's with cutting Destructive Revelry down to Naturalize.
So mostly this section is going to be notes on why I think these are good cards to learn from:
Ranging Raptors is your first creature you're likely to play, and you can use it to ramp a bit (fixing your mana, no less), to defend yourself, or both. Plus, it survives and triggers enrage off of a Pyroclasm, which is sweet. Hope it doesn't get Last Gasp'd, but oh well, it happens.
The stars of the show around 3 cmc are Crystaline Nautilus, which is fragile, but a powerful blocker if it survives, and Savage Knuckleblade himself, already a 4/4 for 3, it has a ton of mana-activated abilities you can use to aid it in every situation.
At 4, Flametounge Kavu needs no introduction, only the sweet sweet smell of napalm spit in the morning, and is quietly probably the best card in the deck, and Long-Finned Skywhale, while more than a little risky on that mana cost in a 3-color deck like this, is just a great way to close out games here, pushing through that lethal damage in the air.
For spells- Pyroclasm only hits Kavu on your side, which is expendable anyways, and is a strong way to keep agro decks in check. Alongside it, you can use Pit Fight and Turn to Frog as combat-based removal spells, which is reliant enough on your creatures to be not ideal, but workable, and Illumination is your primary card advantage early on, even if your primary goal is just to dig for:
Temur Ascendancy. It gives your creatures Haste, which is no small benefit, but more importantly it makes most of the creatures in your deck draw you more cards. Get more than one on the field, and you'll be drawing cards faster than you can get them out of your hand.
Manabase is meant to be a touch lacking, but also super-budget. Look, you try to build a 3-color mana base for less than $2, it's gonna suck, alright? That's the name of the game with budget 3-color manabases.
As for the sideboard, this IS supposed to be a sideboard they learn how to use, to make their deck perform better in the right matchups, or just in general to customize their decks within constraints.
Arborback Stomper is to give you a little bit of lifegain options you can board in for your top-end, as well as just if you feel like you need more threats in the deck.
Naturalize, Negate, and Plummet are all targeted hate cards (Upgrade naturalize to Destructive Revelry if you think the extra 50 cents-ish is worth it), searing spear offers you an additional removal option, sheltering word can protect your units and gain some life, and an extra ascendancy for value matchups.