mtg cards that give rad counters Mariposa Military Base - Magic The Gathering—Fallout #443 (English) fulloracle:"rad counter" · Scryfall Magic:

Plus, having access to blue means you can protect your combo with ease

Wash Out should see more play, as its often a Rivers Rebuke for four mana

By the time your knees have worn through your robe, you may have begun to learn your place. Illustrated by Seb McKinnon Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp

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Its also handy since lots of control decks fall back on 4-mana draw 2s for card advantage

The drawbacks are the same, in that you have to wait until it gets back to your turn for the effect