Runeforge Champion

When this creature enters, you may search your library and/or graveyard for a Rune card, reveal it, and put it into your hand. If you search your library this way, shuffle.
You may pay {1} rather than pay the mana cost for Rune spells you cast.

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Casting a Rune spell for an alternative cost doesn't change its mana cost or mana value.

Runeforge Champion's last ability doesn't change when you can cast a Rune spell.

Runeforge Champion's last ability provides an alternative cost to cast Rune spells. You can't combine this with other alternative costs that may apply. In the unusual case that a Rune spell has additional costs, you can pay those in addition to the {1}. If those additional costs are mandatory, you must pay them in order to cast the spell.