mtg bestow cards Greatness Target creature gets +4/+4 and gains trample until end of turn. Bestow Greatness

When you activate a creatures ability, it goes on the stack, and at that point its independent of whether the creature stays on the battlefield or not

There are no other cards which create Survivor tokens, so its pretty safe

Lifegain effects fall into two categories: single-effect, big bursts of lifegain from cards like Feed the Clan, and incidental lifegain from cards like Soul Warden and Kambal, Consul of Allocation

That is the dilemma

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She discusses its impact on Commander and some of the potential pitfalls of printing too much Goad