As soon as Heliod gives Walking Ballista Lifelink you can dish out infinite damage
3 Teval, Arbiter Of Virtue Dive A Little Deeper Delve has been one of those very strong abilities that is just a little too good under the right circumstances
Here are the dredgers: Life from the Loam: Since we arent drawing cards, this is the only way to get more lands if we need them
Common competitive ratios include: Stage 1 Line: A 4-3 line (four Basics, three Stage 1s) gives you a high probability of starting with the Basic and finding the evolution when you need it
Within the limited realm of Fallout cards, its a powerful card, as there are a lot of counter mechanics at play in the limited set: energy counters, rad counters, +1/+1 counters (especially from Monstrous creatures), muster counters, and more
I think this is the best two-drop for a mono-blue deck with Callaphe and Thassa