Gladehart Cavalry
Support 6 is the widest fan-out the keyword ever asked for, and bolting it to a counters-payoff is what turns a one-time stat spread into something that keeps paying. The enters trigger seeds +1/+1 counters across your board; the second ability then makes every one of those marked creatures worth two life when it dies. That triggered clause rewards a deck built to throw bodies away rather than protect them: every chump block, every sacrifice, every trade refunds life as long as the dying creature carried a counter. Think of it as a go-wide deck's late-game capstone, the thing you drop after a board has already formed, because support 6 wants targets and the lifegain wants those same targets to keep dying and being replaced. The 6/6 is a serviceable body for its cost, but the counters are what make it a closer in an attrition plan, converting a grindy sacrifice loop into incidental life that climbs every combat. It sits at the intersection of two go-wide subthemes that rarely overlap: the +1/+1 counter swarm and the sacrifice-for-value drain. The reward scales with how many creatures you can keep cycling through the graveyard, which makes it a payoff for the kind of deck that treats its own creatures as currency rather than as a board worth keeping.
