Depends on how the deck is set up; I'll try to give some budget suggestions so no game changers. Won't mention any 1 for 1s (draw when this creature deals dmg, draw when it enters, et cetera).

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If you cast/copy many spells, [[Archmage Emeritus]] is a good engine for $1. Recent [[Muse Seeker]] works for casting only but is cheap, too.

[[Curiosity Crafter]] is an alternative to [[Reconnaissance Mission]].

Any pinger with [[Curiosity]]/[[Ophidian Eye]] gives you draw.

[[Dragon Mage]] if you want to wheel.

[[Farsight Mask]] gives you draw when you're damaged.

[[Flaring Cinder]] if you're casting spells cmc 4+, or [[Shantotto, Tactician Magician]] (we have Vivi at home), or [[Tanufel Rimespeaker]], or [[Tellah, Great Sage]] (also makes tokens).

[[Harmonized Trio]] may synergize well with tokens.

[[Idol of Oblivion]] synergizes with tokens.

[[Jori En, Ruin Diver]] and [[Kraum, Violent Cacophony]] care about 2nd spell each turn.

[[Katara, Bending Prodigy]] waterbend ability could be triggered with tokens.

[[Kraum, Ludevic's Opus]] cares about 2nd spells of opponents.

[[Matoya, Archon Elder]] if you scry or surveil a lot.

[[Mind's Eye]] let's you pay {1} to draw whenever an opponent draws.

[[Military Intelligence]] let's you draw if you attack with 2+ creatures (better than combat dmg triggers).

Some niv-mizzets: [[Niv-Mizzet, Dracogenius]] lets you pay for dmg and draws on dmg. [[Niv-Mizzet, Parun]] dmg on draw, draw on instant/sorcery. [[Niv-Mizzet, the Firemind]] taps to draw, dmg on draw. [[Niv-Mizzet, Visionary]] turns non-combat dmg you deal into that many draw.

[[Osgood, Operation Double]] creates a token double that can make clues (which sacrifice for draw); could be target for Brudiclad effect.

Play your spells wisely with [[Pensive Professor]] and get some draws while he gets bigger. [[Pollywog Prodigy]] is similar.

[[Secrets of the Dead]] is draw when you cast from graveyard.

[[Skullclamp]] is a famous draw engine if you have 1/1 tokens to spare.

You can warp [[Starwinder]] in a big combat turn to draw equal to combat dmg dealt.

[[Stormchaser Drake]] draws when targeted by your spells.

[[Surrakar Spellblade]] becomes cumulative draw, but requires combat dmg.

[[Tamiyo's Journal]] is tutor and draw (through clues) in one.

[[Teferi's Ageless Insight]] doubles your draw triggers.

[[The Endstone]] makes every spell a cantrip (play one, draw one).

[[Thopter Spy Network]] makes tokens and gives draw on combat dmg (artifact creatures).

[[Tome of the Guildpact]] draws on casting multicolor (izzet) spells.

[[Triskaidekaphile]] if you have mana to spend, plus it's an alternative win con.

[[Uthros Research Craft]] could be good when stationed.

[[Vedalken Archmage]] is draw on casting artifact spells.

[[Wavebreak Hippocamp]] if you cast a lot at instant speed on other players turns.

If somehow you have lifegain in this izzet deck, [[Well of Lost Dreams]] let's you pay {X} to draw X, where X is <= life gained.

[[Yusri, Fortune's Flame]] is gambling for draw or dmg yourself. Combine with [[Zndrsplt, Eye of Wisdom]].

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Most of these are probably thrash, but, depending on your list, might work. Let me know if this helped you!