You'll probably want to play a bunch of sagas in a Yuna deck, but if you wanted to get cute with it, you could also take advantage of a sacrifice outlet and cards that come with tons of counters like The Millenium Calendar or Dark Depths
(If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.) If Maester Seymour is no longer on the battlefield when its first ability resolves, use its power as it last existed on the battlefield to determine how many +1/+1 counters to put on the target creature
It relies heavily on manipulating Strength to deal with the opponent
Temporarily copying enchantments, then stacking lore counters
(2) All attacking and blocking creatures are removed from combat
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