SirFowler

It's all good. I've built a few decks with around a $50 budget previously, so I get that the challenge can be a lot of fun in and of itself. I started off Magic as a broke college student, so it was usually a $50 starting budget that got upgraded over time, but I digress.

Feather can be fun to build on a budget, but if you want a solid budget option that can win consistently, look into Zada, Hedron Grinder as well. Mono-red pump spells with a goblin subtheme can be a gross amount of fun, especially with all the common-rarity pumps that are available. I've seen $25 builds for her that can curbstomp decks built with significantly higher budgets.

Out of curiosity, when you say hyper budget, how budget are we talking? Is there a monetary limit you're trying to stay under?

For starters, your mana ramp and card draw is incredibly limited. Especially for an aggro strategy, running out of cards in hand and mana to use is especially detrimental. You have some card selection with Akal Pakal, First Among Equals, but that can be a slow process when you're not flashing out artifacts on each turn. Some cards I might recommend:

Thought Monitor and Thoughtcast - cheat these out with affinity for easy one-time value. Prices are around $0.50 and $1.00, respectively.

Mask of Memory - equip onto a flyer or other evasive creature for consistent looting. ~$0.31

Hedron Archive - 6 mana over a couple of turns to be able to draw 2 isn't bad. ~$0.12

Aether Syphon - If you have the extra mana to pay into this, 2 mana to draw an extra card per turn is decent. ~$0.08

Transplant Theorist - loot whenever you play an artifact, plus get the ability to tuck cards back into your library to theoretically be able to replay later. ~$0.06

Coveted Jewel - 6 mana draw 3, then add 3 mana back. If you get attacked and don't have the ability to block one, sure, that opponent gets control of the jewel. However, it tends to start a minigame where people will just attack the Coveted Jewel's controller rather than you. ~$0.18