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Curse of Fiend

Chaos Hunter X DARK Level 7 [ Fiend / Effect ] ATK 2500 DEF 1600 When your opponent Special Summons a monster (except during the Damage Step): You can discard 1 card

It can be a surprise flying blocker that draws you a card, or it can be all that plus a deathtouch creature that takes out whatever it blocks

And instead of requiring Polymerization and the right fusion materials like most fusion monsters, they require a HERO monster of a particular attribute as well as their quick-play spell card Mask Change

There's no right or wrong answer here - it all comes down to personal preference