Whenever you gain life, each Advisor, Artificer, and Monk you control gains vigilance and gets +X/+0 until end of turn, where X is the amount of life you gained
The downsides are firstly the life management, but Im sure a navigated player can leverage this resource as they need
It also goes very well with a lot of shuffle effects from land fetch cards and any excess life gain tools you might have
While including this card would seem like an easy choice, its also currently sitting at about $80-$100
Conflux The ultimate tutor for 5-color decks, Conflux gives you one card of each color, which turns a single spell into a full grip of answers and threats
Budget Magic : Mono-Blue Storm (Standard) The Deck Mono-Blue Storm is essentially a Standard-legal form of Storm, with Aetherflux Reservoir being our version of Tendrils of Agony