Suncrusher, at most, enters the battlefield with five +1/+1 counters, but once you're done using its counters you can return it to your hand and recast it
Heroic decks and Equipment strategies will too
I don't see building a Alrund / Hakka "both is good" gameplan with these two
Theres always incentive to wheel and deal, and players motives shift moment to moment, rewarding those who can read the field and know how to put pressure on trading partners at exactly the right time
Youre playing them from exile, so your favorite paradox payoffs work with it, as do your artifactfall triggers
One cool application might be Modern Yawgmoth where you're happy to reset your Undying creatures with -1/-1 counters - and it's just one possible way to lighten the burden