The First Doctor

Cascade normally leaves nothing behind on the caster's side: the keyword's whole payload is the free spell it flips into, resolved once and forgotten. The second ability rewrites that arithmetic by keying off the cast, not the resolution. Whenever you cast a spell with cascade, a +1/+1 counter goes on target artifact or creature, and because the trigger fires on the cast itself, it pays out even if the cascade spell gets countered or fizzles: you keep the counter regardless of what happens on the stack above it. That timing detail is the design's real cleverness, converting a tempo keyword prized for its one-shot value spike into a durable, per-cast growth engine. The first ability is the setup half, a named-permanent tutor that pulls TARDIS from library or graveyard, so this leader arrives with a fixed partner rather than a general toolbox; the two abilities together assemble a two-card relationship, the guaranteed entry piece and the incremental counter stream. Because the counter can land on any artifact or creature, the growth is not confined to a single threat: it can build a beater, harden a mana rock, or feed anything that counts +1/+1 counters. What makes the whole thing cohere is the fusion of two effects that almost never share a card, a tutor that guarantees a specific permanent and a cast-triggered ability that turns cascade's transience into compounding board development.