magic the gathering march of the machine collector booster box Machine: Aftermath Leaks including 1–2 card(s) of rarity Rare or higher and 3–5 Uncommon March of the Machine Collector

Elemental HERO decks have options for plenty of Fusion Monsters, as well as Link Monsters if you dip into the Xtra HERO lineup

This gives it some advantages compared to both of its counterparts, since you're not capped at only a single copy, and playing it doesn't use up your single chance to play a supporter in a turn

While some of these are getting harder to find, you can still do so

If youre not familiar with it, heres how it works

All still provide one of the most efficient and immediate returns on cards for the mana and still see occasional use but with most decks being more traditional agro, midrange and control these cards are too risky and too symmetrical to be appropriate very often